Dear Ritesh,
regard the CU50 testing for calling the variant it working well but i got the below info.
and regard adding a standard components in BOM here is the BOM from the master data
but in the production order .. the class didn't replaced with it's material.
and the assigned BOM application in OPL8 is PP01 .. Also in CS12 after adding the raw materials directly in the bom i got the right result for the materials and i didn't get any thing for the class.
BR,
Salah