Editing from Inbox - can I make some fields read-only once they've been previously completed?

[SaraMiller]

I have a survey with repeats which will use the Inbox to edit and add records to the repeat.  However, I want to prevent the "metadata" that sits outside the repeat from being edited by subsequent users after the initial submission.  I was trying to use an "if" statement in the readonly column, but getting nowhere.  XLS form attached.

Fields to become read-only when editing from Inbox:

Region

Site

Other Site Name

Other Site Grid Reference

Platform Name or ID

Platform Map Location

[ZacharySutherby]

Hello @santamariaa, 

Are you using the Survey123 field app or web app? You mentioned opening the survey in a Dashboard so it sounds like you may be using the web app. 

At this time the web app does not support expressions in the read only column. Please see the Form expressions documentation for reference. We have ENH-000140250 in our backlog to support this in the future. Please feel free to reach out to Esri Technical Support to be attached to the enhancement and track progress on the feature.