Initial Value Rule Not Working on Edit Requisition (RSSP)

Summary:

Hi Community,

We have a DFF SN Line Cost that is updated by a custom API before users open the Edit Requisition page. Requirement: if this field already has a value, the system should hide the Attachments region at PR Header and Line.

I created a VB Form Rule with condition “Initial Value of SN Line Cost is not null” and action to hide Attachments. The rule is active, but on opening Edit PR, the Attachments region is still visible. It seems Initial Value is not evaluated on page load, even though the DFF value exists before entering edit mode.