supplier xxx not intended for purch. org. changing po xxxx

Hi guys,

On my SRM process the purchase order are transfered to backend system.

But, when I change one PO on EBP, system gives me a message 'supplier xxx not intended for purch. org. changing po xxxx', and don't replicate the changes on backend PO document.

If I consult one changed PO on EBP, the document have status 'saved' , and the traking detail maintain details of changes.

Can you advice me what i can do to transfer PO changes to backend system?

Best regards,

Helena