Requisitions Charge Account is affected after 12.1.3+ (RPC3).

Hello,

   In our EBS instance previous implementation assigned location codes using DFF which in turn used to override the Requisition Charge Account Location segment when the Requisitioner selects the Deliver-to location. After recent patching using 12.1.3+ (RPC3), the override mechanism is not working and the default expense account from the employee record for non-catalog requisitions shows up as is. The same for catalog requisitions as they pull the same from the item un affected. I am trying to understand which mechanism in place setup to do the segment override and why this mechanism is affected by this recent patching. If