Hi Reda,
Thanks for your response, so ABAP intervention is the only option? no SAP standard procedure to handle this scenario? btw I contacted SAP and they said the system is behaving the way it should. Not only FB1D(F-32) the system will behave the same for FB1K, FB1S and FBRA transactions which are defined in the standard table T8G10. When the document split has these transactions the split will be based on the above transaction types and Variant not from the Document type (Active method).
Thanks!
Srikanth