Set Up EDI Inbound Voucher Processing - Supplier Number - Need clarification

Hi Group Members

Reference support Doc ID 943041.1

First attempt to upload voucher transaction failed. I used P47040 to add a record. I updated fields narrated in the document. I have a question on inputting supplier number. Let us look at three sources of information I am currently comparing

Source 1) Doc ID 943041.1

Step 3.In the grid, populate Supplier Number (data dictionary item AN8) and Invoice Number (data dictionary item VINV).

Source 2) R47041 output and tool tip attached to Processing Option parameter on supplier number

So despite inputting Supplier Number, the report rejected a record stating valid supplier number must be entered. The supplier number is validated against Address Book. So, it is valid.