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Can't customize form for document library with lookup field

I want to create customized form in SPO for document library where one column is lookup but I keep getting this error:

  "status": 400,
  "message": "The required field \"Project Name\" data type is not supported\r\nclientRequestId: 6b513bc3-429a-457b-a65d-fddffb0055ca\r\nserviceRequestId: 6b513bc3-429a-457b-a65d-fddffb0055ca"
StackLength: 1537
Stack: AppMagic.Services.ServiceError: <MESSAGE REMOVED>
    at t [as constructor] (
    at t [as constructor] (
    at new t (
    at Function.t.createServiceError (
    at Object.q [as _notify] (
    at Object.enter (
    at c.Class.derive._oncancel._run (
    at c.Class.derive._oncancel._error (
    at u (

Session ID: 81a3912c-5074-4948-b7cb-85f37bc7b38b

I thought that lookups are supported so why is it suddenly refusing to create the form?

Community Support
Community Support



Lookups should be supported so I am not certain what is causing your error here. Maybe there is some kind of data type conflict. This might be a better question for Microsoft Support. I'll include a link below; on opening a ticket with them if you would like to go down that route. Otherwise if any other communities members might know feel free to chime in.


If you would like to create a ticket with Microsoft Customer Support here is a link on how to do so:








Community Support Team _ Alex Rezac
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

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