PBXX is not possible in RFQ
In PO pricng we may mainatin the PB00 and PBXX..... the why not then system will not allow for RFQ or QUotation...PBXX is not allow in RFQ conditions..
PBXX is the conditon used where no RFQ or info record or contract is maintained than Po will not have PB00 so to enter the Gross price you need PBXX in the PO
the pricing condition in the RFQ or contract or info you will see the supplement pricing not main pricing that you can see from PB00 condition
go to M/06 and locate PB00
here you will see the pricing procedure at the middle section
this is used in RFQ, contract and info record