Create Accounting is giving Cost Variance though the cost of the item has not changed

Summary:

The customer is experiencing a warning in the Create Accounting program related to cost variance for transactions involving the event class "Intraorganization Transfer" and event type "Transfer Order Return Intraorganization Shipment" while using Perpetual Average costing. Despite the item cost remaining unchanged, the execution report shows an error indicating that input source values do not map to any output value in the "Cost Variance" mapping set, suggesting missing default or complete mappings.I reviewed the distributions for the item and found that there is a cost source on the transaction called Transfer Price which is causing this variance. Has anyone experienced