In a drop ship scenario, there are 3 parties involved, seller, inter-company supplier and the customer.
During goods receipt, the accounting entry will be generated in the seller's book:
Dr COGS (A)
Cr GR/IR clearing (B) (amount seller pay to interco supplier)
Cr freight reimbursement (reimbursement amount that seller pay to interco-supplier)
When the seller bills customer, in the seller's book, the COPA will be created together with the normal FI billing document. The GR/IR clearing amount (B) is the COGS in COPA. However we expect the COGS (A) as the COGS in COPA.
Are there any solution in the configuration or user exit?