Field Pur Doc and WBS status in Down Payament F-48 transaction

Dear Fellows,

When I am trying to cteate down payment (F-48), I am not able to see the fields Purchasing Document and WBS(suppressed some whereA). I have checked OBC4 for FSG for the alternate GL account and OB41 for Pkey both the places fields are optional. Please advise me.

Thanks & Best regards