3416470 - Error: Ref ID for Return DEF is not valid. Enter a valid ref ID.

While opening the Customer Return, system shows the error messages

"Sales Order reference with ID ABC not valid" (ABC represents the Sales Order ID)

"Ref ID for Return DEF is not valid. Enter a valid ref ID." (DEF represents the Return ID)

Item XX: Copying item XX not possible; configuration from Product - project-based to missing (XX represents the line item number).

SAP Business ByDesign

PMAT; Return; configuration from Product - project-based to missing; Project Stock Order; Reference; invalid; not valid; Enter a valid ref ID; Project; Sales Order;  , KBA , AP-CRP , Customer Return Processing , Problem