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Community Champion
Community Champion

CUSTOM CONNECTORS: Making POST values optional?

Hello @v-xida-msft , 

I'm working through your recommendation here, testing some things out on a POST method.


  • My scenario also involves a POST request using a JSON body
  • I want to make some values in the POST body optional in PowerApps
  • I set them to Required-No and Visibility-Advanced in the Custom Connector
  • In the Custom Connector Test Area, I paste in the new "partial schema" (same schema as before, but with the optional values removed), TESTS OK (status 200, successful).
  • But, in the app, when I remove the entire set of (now optional) values from the JSON POST body, I get the error:
    • "Missing column. Your formula is missing column <value_I_want_optional> with a type of record."
    • "Invalid argument type. Expecting a Table value but of a different schema."
  • Likewise, when I remove one of the values from the JSON POST body, I get the error:
    • "Missing column. Your formula is missing column <value_I_want_optional> with a type of text."
    • "Invalid argument type. Expecting a Table value but of a different schema."
  • How do I make POST values in the JSON body optional?

Troubleshooting thus far:

  • Disconnected the Custom Connector from the app
    • Save/Close/Reopen
  • Reconnected the Custom Connector to the app
    • Save/Close/Reopen
  • Deleted and recreated the Connection
    • Save/Close/Reopen
  • Waited ~2hours...

Nothing seems to work. Ideas?

Regular Visitor

Hey ericonline,

did you ever find a solution? I have the same problem 😕 and it seems like this bug it is still there.


New Member

Anyone? I have the same problem. Did anyone find a solution?

New Member

Did anyone find a solution to this?  Same issue, here.

I did find a workaround using Policies, which I explained here

Regular Visitor

I have the below:
    "cc_emails": [],
    "fwd_emails": [],
    "reply_cc_emails": [],
    "ticket_cc_emails": [],
    "type""Service Task",
    "custom_fields": {
        "cf_nature_of_call""Repair / Call Out",
    "tags": [],
    "attachments": [],
    "associated_tickets_list": [
I'm using a custom connector but whenever i try to update one of the record in custom_field im getting a "missing column error" all the values are optional. How can I use policies as you said for my issue please ?

Yes, this is exactly the Problem.

Only the top-Level Properties (cc_emails, ...) can be made optional.

To use my workaround you need add the custom field properties (cf_organization, ...) as top-Level property (so not under custom_fields: { ... }). Then add a "Set-Property" policy for each required operation (Update/Create): With

Parent Path


Value to add  {@body()}
Relative Path  custom_fields


This way they get recognized as optional and the policy formats the body correctly when the request is sent.

This is very hacky and leads to duplicate properties at the wrong place, but at least it works most of the time. I was in contact with their support, and they recognized the issue, but it seems as if it is still not fixed.

what do you mean by : you need add the custom field properties (cf_organization, ...) as top-Level property (so not under custom_fields: { ... }).  ?



Instead of having the cf_ properties nested inside the custom_field object


"cc_emails": [],
"fwd_emails": [],
"reply_cc_emails": [],


"custom_fields": {
    "cf_organization": null,
    "cf_nature_of_call": "Repair / Call Out",
    "cf_description_of_work": "TEST",



They need to be on the first level because only there PA will treat them as optional. So just add them like the other so it looks like this:


"cc_emails": [],
"fwd_emails": [],
"reply_cc_emails": [],

"custom_fields": {},
"cf_organization": null,
"cf_nature_of_call": "Repair / Call Out",
"cf_description_of_work": "TEST",



The policy will copy everything into the custom_fields object when the request is sent.

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