Showing results for 
Search instead for 
Did you mean: 
Resolver I
Resolver I

Date Dependent n:n Relationships - This is tricky, how would you handle this?

Here's my scenario and what I have setup so far:


I'm working with an event production company - to simplify, I'll stick to the three main entities.  



A list of products with product ID's & barcodes.

There are two types - serialized and non-serialzed.

Serialized items are Product ID's that have many barcodes - the product is the same, but each item gets it's own barcode.

Non-Serialized items have only 1 barcode to 1 Product ID.  They have a quantity # of more than 1.



Show name, Show ID, start date, end date, budget, location, etc.



Each show is attached to a Pullsheet entity.  This is a list of inventory items needed for that particular show.  



Inventory n:n PullSheet n:1 Show


How would you handle tracking stock??

There are two things I can think of that need to happen to prevent overbooking inventory items:


1. Inventory should only be Related (I'm referencing the Related/UnRelated Functions) during the actual dates of the Show/PullSheet - or maybe 1 day before and after.  Otherwise, a PullSheet created for a Show 3 months in advance would affect the amount of Inventory available before the Inventory is actually needed.  


2. I have an InStock and Owned Stock quantity in the Inventory entity - when an Inventory item is Related to a PullSheet, the InStock quantity needs to subtract from the owned stock.  This is, again date dependent, but I think this function will work at the same time as the above function.  Just not sure how to write it.  



@Shanescows love your vids, would really appreciate your input on this

Most Valuable Professional
Most Valuable Professional



Regarding Relate/Unrelate functions:


We believe Relate is almost equivalent to setting a Lookup field, and Unrelate almost equvalent to setting it blank.

The difference is that a Lookup field need not be present at all as it operates on the relationship.


We also believe that N:N relationships do not technically "exist" on the system Common Data Service. There are really 1:N and N:1 only from our investigation into this.

Even this statement from just makes this seem to be even more likely:


"For many-to-many relationships, the system that links the records maintains a hidden join table. You can't access this join table directly; it can be read only through a one-to-many projection and set through the Relate and Unrelate functions. Neither related entity has a foreign key."


We are not primarily relying on the statement above, though, but rather, an investigation over time into how the system really works.


Therefore, for more flexibility, you may want to set up the one to many and many to one yourself, as the any to many actually is a one to many and many to one in disguise, if you set them up 1:N and N:1 manually you have more control.


Regarding the rest of your query about tracking stock:


  1. We are unsure Relate and Unrelate are much different from setting a Lookup field conceptually.
  2. Therefore, we might suggest that you try modeling 1:1 as an attribute and use Business Rules as described here in our reply o your previous post What type of relationships do i need? 
  3. One caveat not discussed above in much detail (or actually even at all) in our reply, was the quantity piece. We did not mention the possibility that you also need a Quantity field somewhere in this scenario, even if it could have been surmised as early as when you mentioned Serialized and Non Serialized items. That would be especially for Non Serialized. Even Serialized - maybe each Inventory still need a numeric Quantity attached to it for each Inventory - however, that Quantity would probably be either under a line item from PullSheet or somewhere like that - maybe this is part of your question.
  4. To subtract from stock you decide first where you put this Quantity. Next, you can subtract a Quantity by saying Quantity -1 in PowerApps.
  5. As for removing the Inventory completely from Pull Sheet Line Item if it is Zero, you could check if it is zero. and this is where your Unrelate can help - because you may want to use Unrelate to perform the operation on the relationship level, rather than  worry about setting an explicit lookup field (just note that the concept of Relate and Unrelate is still similar to directly setting and unsetting a Lookup field - a Lookup Field is in fact added every time you make a Relationship in CDS because the Lookup Field stores the info about the reference).


The above could be an approach to start with.

A complete solution, however, would be very involved for this.

Perhaps the above could be a high level starting point.


For Date dependent stock subtraction, etc. you may need to consider Power Automate (Flow) so that action is taken upon the stock with or without the PowerApp Canvas App itself having to be open, depending on the scenario.


What do you mean about more control?  Doesn't the n:n relationship do the same thing as setting up 1:n and n:1 separately?

Most Valuable Professional
Most Valuable Professional



You're right, the N:N is better sometimes for a specific reason. For example, in your case N:N may be better because if you want to do something like emulate a "multi selectable lookup" - there are multi selectable Option Sets but those have a fixed value, and unfortunately there is no such thing as a "multi-selectable lookup". So the typical solution to do something like that, say, from a "Model Driven App" is instead to use a N:N and then use a Subgrid inside the Model Driven App form to be able to accomplish this.


In that case, the N:N may be better for you for cases like that, so for that part, especially wherever you are using N:N for this specific reason, you may want to keep doing it that way.

Helpful resources


Copilot Cookbook Challenge | Week 2 Results | Win Tickets to the Power Platform Conference

We are excited to announce the "The Copilot Cookbook Community Challenge is a great way to showcase your creativity and connect with others. Plus, you could win tickets to the Power Platform Community Conference in Las Vegas in September 2024 as an amazing bonus.   Two ways to enter: 1. Copilot Studio Cookbook Gallery: 2. Power Apps Copilot Cookbook Gallery:   There will be 5 chances to qualify for the final drawing: Early Bird Entries: March 1 - June 2Week 1: June 3 - June 9Week 2: June 10 - June 16Week 3: June 17 - June 23Week 4: June 24 - June 30     At the end of each week, we will draw 5 random names from every user who has posted a qualifying Copilot Studio template, sample or demo in the Copilot Studio Cookbook or a qualifying Power Apps Copilot sample or demo in the Power Apps Copilot Cookbook. Users who are not drawn in a given week will be added to the pool for the next week. Users can qualify more than once, but no more than once per week. Four winners will be drawn at random from the total qualifying entrants. If a winner declines, we will draw again at random for the next winner.  A user will only be able to win once. If they are drawn multiple times, another user will be drawn at random. Prizes:  One Pass to the Power Platform Conference in Las Vegas, Sep. 18-20, 2024 ($1800 value, does not include travel, lodging, or any other expenses) Winners are also eligible to do a 10-minute presentation of their demo or solution in a community solutions showcase at the event. To qualify for the drawing, templates, samples or demos must be related to Copilot Studio or a Copilot feature of Power Apps, Power Automate, or Power Pages, and must demonstrate or solve a complete unique and useful business or technical problem. Power Automate and Power Pagers posts should be added to the Power Apps Cookbook. Final determination of qualifying entries is at the sole discretion of Microsoft. Weekly updates and the Final random winners will be posted in the News & Announcements section in the communities on July 29th, 2024. Did you submit entries early?  Early Bird Entries March 1 - June 2:  If you posted something in the "early bird" time frame complete this form: if you would like to be entered in the challenge.   Week 1 Results:  Congratulations to the Week 1 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge. Copilot Cookbook Gallery:Power Apps Cookbook Gallery:1.  @Mathieu_Paris 1.   @SpongYe 2.  @Dhanush 2.   @Deenuji 3.  n/a3.   @Nived_Nambiar  4.  n/a4.   @ManishSolanki 5.  n/a5.    n/a   Week 2 Results:  Congratulations to the Week 2 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge. Copilot Cookbook Gallery:Power Apps Cookbook Gallery:1. Kasun_Pathirana1. ManishSolanki2. cloudatica2. madlad3. n/a3. SpongYe4. n/a4. n/a5. n/a5. n/a

Win free tickets to the Power Platform Conference | Summer of Solutions

We are excited to announce the Summer of Solutions Challenge!    This challenge is kicking off on Monday, June 17th and will run for (4) weeks.  The challenge is open to all Power Platform (Power Apps, Power Automate, Copilot Studio & Power Pages) community members. We invite you to participate in a quest to provide solutions to as many questions as you can. Answers can be provided in all the communities.    Entry Period: This Challenge will consist of four weekly Entry Periods as follows (each an “Entry Period”)   - 12:00 a.m. PT on June 17, 2024 – 11:59 p.m. PT on June 23, 2024 - 12:00 a.m. PT on June 24, 2024 – 11:59 p.m. PT on June 30, 2024 - 12:00 a.m. PT on July 1, 2024 – 11:59 p.m. PT on July 7, 2024 - 12:00 a.m. PT on July 8, 2024 – 11:59 p.m. PT on July 14, 2024   Entries will be eligible for the Entry Period in which they are received and will not carryover to subsequent weekly entry periods.  You must enter into each weekly Entry Period separately.   How to Enter: We invite you to participate in a quest to provide "Accepted Solutions" to as many questions as you can. Answers can be provided in all the communities. Users must provide a solution which can be an “Accepted Solution” in the Forums in all of the communities and there are no limits to the number of “Accepted Solutions” that a member can provide for entries in this challenge, but each entry must be substantially unique and different.    Winner Selection and Prizes: At the end of each week, we will list the top ten (10) Community users which will consist of: 5 Community Members & 5 Super Users and they will advance to the final drawing. We will post each week in the News & Announcements the top 10 Solution providers.  At the end of the challenge, we will add all of the top 10 weekly names and enter them into a random drawing.  Then we will randomly select ten (10) winners (5 Community Members & 5 Super Users) from among all eligible entrants received across all weekly Entry Periods to receive the prize listed below. If a winner declines, we will draw again at random for the next winner.  A user will only be able to win once overall. If they are drawn multiple times, another user will be drawn at random.  Individuals will be contacted before the announcement with the opportunity to claim or deny the prize.  Once all of the winners have been notified, we will post in the News & Announcements of each community with the list of winners.   Each winner will receive one (1) Pass to the Power Platform Conference in Las Vegas, Sep. 18-20, 2024 ($1800 value). NOTE: Prize is for conference attendance only and any other costs such as airfare, lodging, transportation, and food are the sole responsibility of the winner. Tickets are not transferable to any other party or to next year’s event.   ** PLEASE SEE THE ATTACHED RULES for this CHALLENGE**

Celebrating the June Super User of the Month: Markus Franz

Markus Franz is a phenomenal contributor to the Power Apps Community. Super Users like Markus inspire others through their example, encouragement, and active participation.    The Why: "I do this to help others achieve what they are trying to do. As a total beginner back then without IT background I know how overwhelming things can be, so I decided to jump in and help others. I also do this to keep progressing and learning myself." Thank you, Markus Franz, for your outstanding work! Keep inspiring others and making a difference in the community! 🎉  Keep up the fantastic work! 👏👏   Markus Franz | LinkedIn  Power Apps: mmbr1606  

Your Moment to Shine: 2024 PPCC’s Got Power Awards Show

For the third year, we invite you, our talented community members, to participate in the grand 2024 Power Platform Community Conference's Got Power Awards. This event is your opportunity to showcase solutions that make a significant business impact, highlight extensive use of Power Platform products, demonstrate good governance, or tell an inspirational story. Share your success stories, inspire your peers, and show off some hidden talents.  This is your time to shine and bring your creations into the spotlight!  Make your mark, inspire others and leave a lasting impression. Sign up today for a chance to showcase your solution and win the coveted 2024 PPCC’s Got Power Award. This year we have three categories for you to participate in: Technical Solution Demo, Storytelling, and Hidden Talent.      The Technical solution demo category showcases your applications, automated workflows, copilot agentic experiences, web pages, AI capabilities, dashboards, and/or more. We want to see your most impactful Power Platform solutions!  The Storytelling category is where you can share your inspiring story, and the Hidden Talent category is where your talents (such as singing, dancing, jump roping, etc.) can shine! Submission Details:  Fill out the submission form by July 12th with details and a 2–5-minute video showcasing your Solution impact. (Please let us know you're coming to PPCC, too!)After review by a panel of Microsoft judges, the top storytellers will be invited to present a virtual demo presentation to the judges during early August. You’ll be notified soon after if you have been selected as a finalist to share your story live at PPCC’s Got Power!  The live show will feature the solution demos and storytelling talents of the top contestants, winner announcements, and the opportunity to network with your community.  It's not just a showcase for technical talent and storytelling showmanship, show it's a golden opportunity to make connections and celebrate our Community together! Let's make this a memorable event! See you there!   Mark your calendars! Date and Time: Thursday, Sept 19th Location: PPCC24 at the MGM Grand, Las Vegas, NV 

Tuesday Tip | Accepting Solutions

It's time for another TUESDAY TIPS, your weekly connection with the most insightful tips and tricks that empower both newcomers and veterans in the Power Platform Community! Every Tuesday, we bring you a curated selection of the finest advice, distilled from the resources and tools in the Community. Whether you’re a seasoned member or just getting started, Tuesday Tips are the perfect compass guiding you across the dynamic landscape of the Power Platform Community.   To enhance our collaborative environment, it's important to acknowledge when your question has been answered satisfactorily. Here's a quick guide on how to accept a solution to your questions: Find the Helpful Reply: Navigate to the reply that has effectively answered your question.Accept as Solution: Look for the "Accept as Solution" button or link, usually located at the bottom of the reply.Confirm Your Selection: Clicking this button may prompt you for confirmation. Go ahead and confirm that this is indeed the solution.Acknowledgment: Once accepted, the reply will be highlighted, and the original post will be marked as "Solved". This helps other community members find the same solution quickly. By marking a reply as an accepted solution, you not only thank the person who helped you but also make it easier for others with similar questions to find answers. Let's continue to support each other by recognizing helpful contributions. 

Reminder: To register for the Community Ambassador Call on June 13th

Calling all Super Users & User Group Leaders     Reminder: To register for the Community Ambassador Call on June 13th—for an exclusive event for User Group Leaders and Super Users! This month is packed with exciting updates and activities within our community.   What's Happening: Community Updates: We'll share the latest developments and what's new in our vibrant community.Special Guest Speaker: Get ready for an insightful talk and live demo of Microsoft Copilot Studio templates by our special guest.Regular Updates: Stay informed with our routine updates for User Groups and Super Users.Community Insights: We'll provide general information about ongoing and upcoming community initiatives. Don't Miss Out: Register Now: Choose the session that fits your schedule best.Check your private messages or Super User Forum for registration links. We're excited to connect with you and continue building a stronger community together.   See you at the call!  

Top Solution Authors
Top Kudoed Authors
Users online (5,100)