Order Revision error for a Source SO -primaryflag attribute is True in source payload

Issue: A Sales Order from a different Source System and Order in Fusion created successfully, however when trying to create a revision of SO in fusion, it hits with the error as below.

Error: Order validation: An order was not created as only one product price or return charge can be identified as the primary charge in the source order with the following details: source order 021353-2026, source order line 1, source order schedule 1. Check the charges, and resubmit the order.

Root cause was pointing to the 'Primaryflag' attribute is set to True for all the charge components in payload, that was not the case, only the base price unit charge code was set as Primaryfalg to True.