I have only tested this i Dynamics AX SP2, but I would guess that this is also a problem in SP1.
When registering a Sales Order of the type “Returned item”, there are some validations and other functionality that apply. To start with you get an auto generated RMA number. There is also not possible to enter a positive quantity on the order lines, because that would defeat the purpose of the Sales type “Returned item”. The customer is supposed to get money back, not pay the items price again when returning it.
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