Hi Dapo,
You can see the cost of individual work center and cost center combination wise based on your assignment you maintain in CR01 etc...
Next you can execute line item reports of KSB1, KSB1N AND KSB2 with respective assignment of work center and cost center then only it will update the cost.
Based on above process only you may chances to retrieve the cost of work center wise.
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Regards,
@KRK@