Hi Sharu
That means you are using Variant Configuration.. The options chosen by the customer are specified in the Sales Order. To transfer these values to COPA, you write a derivation rule using VCONF
If your billing document is posted with ABC and not XYZ, this means you need to redetermine Prof Segment at the time of billing
This can be done using Substituion Step in OKC9 (you can search for a SAP note for the same) or by means of a SD routine
Rgds
Ajay M