RTV doesn't create a debit memo

Hello,

I'am using 12.1.3 and I'm trying to create a RTV without success, I have checked the following:

1.The supplier site is marked to allow RTS transactions.
2. There is an original invoice already in AP for the item being returned.
3. The PO and the original Invoice are not for the same Supplier Site but there is a relationship
4. The Supplier Site have a Pay Site and a Purchasing Site -  created a relationship
5. The return quantity didn't cause the quantity invoiced to go negative and the return quantity must be equal to or less than the
     quantity invoiced.
6. The Create Debit Memo check-box is turned on in the Receipt form.