Unreferenced RMA is failing when we are trying with ATO item

Unreferenced RMA is failing when we are trying with ATO item

We are getting the below error

SourceTransactionLineNumber 1, SourceScheduleNumber 1: You must include a reference order when you return a configured item or cancel a configured service.
SourceTransactionLineNumber 1, SourceScheduleNumber 1: The order was not priced because the quantity for each model for the line does not contain a value. Make sure this quantity contains a value, and then reprice.