Condition to Notify if it already exists - error: Invalid argument type

[TesDA]

I have a form: EditForm1

The main question is for the end user to supply a ProjectID

If that ProjectID already exists in the entity, Id like the end user to receive a warning that it already exists.

This is what I have so far, however I'm getting an error on the first equal sign that says "Invalid argument type":

If(!IsBlank(LookUp(ProjEmergencies, ProjectID = ComboBox3.SelectedItems.Result))=false, Notify("That Project already exists",Warning), SubmitForm(EditForm1);Navigate(BrowseScreen1,ScreenTransition.Fade))

The data is being put into an entity on the common data service.

what am I doing wrong?

[eka24 · Accepted solution]

If(CountRows(Filter(ProjEmergencies,ProjectID=ComboBox3.Selected.Result )) > 0,
Notify("That Project already exists",Warning), SubmitForm(EditForm1);Navigate(BrowseScreen1,ScreenTransition.Fade))

[Anonymous]

I think this may have something to do with the CDS columns need to be in a certain state, some setting in PowerApps I think? 

@PowerAddict 

[WarrenBelz]

Hi @TesDA ,

Try

If(
   IsBlank(
      LookUp(
         ProjEmergencies,
         ProjectID = ComboBox3.SelectedItems.Result
      )
   ),
   SubmitForm(EditForm1);
   Navigate(BrowseScreen1,ScreenTransition.Fade),
   Notify("That Project already exists",Warning)
)

I also got rid of the Not argument which is not delegable.

Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

[WarrenBelz]

Hi @TesDA ,

You have marked your original post as the Solution - is this what you intended to do?

[TesDA]

That doesn't appear to be the case. I have marked the solution from another user I implemented first that worked.