Houda,
Automotive industry uses Product Cost by Order, as it is discrete mfg. Repetitive mfg uses cost collectors, and they are, product cost by period.
PP Integration: The components need BOM, Routing, Work Centers, all need to be created by them. A lot of integration happens here with CO. i.e. AType and their prices
WIP Calculation is by Results Analysis.
Is that helpful?
regards,
Dave