EBS Purchasing Approval Rules - use of wild card for range

Our company recently upgraded to R12.  We require item category range rules for specific buyers.  In 11.5.10.2, we were able to set up ranges for our 3 segment category codes.  Our first segment is numeric, but the other two segments are alpha characters.

Previously, we were able to set up rules such as Low range (0003-/--/-) to High Range (0005-/Z/Z).  We use these rules in a workflow customization to auto assign requisition items/services to specific buyers based on category range.  We are currently not using AME for Requisition approvals but plan to do so in the very near future.