How to stop a custom field being edited to blank?

Kirsty Mcloughlin

On one of create screens we have a mandatory field called 'Project Manager' which is a user picker field.

We have found however, that people are later deleting their name out of this field, leaving it blank which is bottle-necking our process.

How do I implement it so that if someone tries to remove their name from this field then an alternative name MUST be inserted and not left as blank?

Salzi

Remove the field from the edit screen and make it only editable in one tranistion to itself (with a separate mask for this) then you can then use a validation that checks whether the field is filled out.