Inquiry into enabling Read-Only on the field OwnerTeam in Task form once Task has been saved?
To ensure Owner Team becomes read only as soon as it’s filled and saved, just use the following expression:
Launch Configure Application
Open the Task.Assignment business object
Select Business Rules
Add a new Read Only rule for OwnerTeam
Select "This field is conditionally read only based on an expression
Enter $(OwnerTeam != null) in the Expression Editor