Cost component structure

Hello friends

I've two cost component structures i.e. A1 & B1 defined in the system. I've assigned the cost comp str A1 to the costing variant that is used for the cost rollups.

I assume it is the same cost comp str A1 that will be used in displaying the costs itemization in the screen of COST ANALYSIS of a PRODUCTION ORDER(CO03).

The problem now is, for the COST ANALYSIS screen the system is using a different cost comp str i.e, B1.!

Am I missing some assignments here..? or how is the system behaving..? Can anyone explain please..?

Thanks in advance

SHIV