Category Mapping for Punchout

When we implemented punchout several years ago  , we defined different categories so when the item is purchased , it can be assigned to a correct GL Account.

I was told by Oracle Support , in case of punchout , the  GL Account is derived from a  setup done in Expense Account Rules.

I verified that that Categories setup in Expense Account Rules match my setup in E_commerce Gateway -Code Conversion Values- Interal Value Column.

However in our case , regardless of what is purchased from that supplier, everything defaults  to only one GL Account.

Could someone please advise how this is supposed to work ? Here is our goal: When a requisition is created thru punchout from that supplier, it needs to hit correct GL Accout based on an item category.