SUS PO xml is missing for inviced PO.

Hi Experts,

I have created a PO and invoiced it in ECC system. Then we planned to move the supplier to SUS system and hence BP was created and the PO was pushed after that. But the PO has not got updated in SUS system. even the xml has not got generated in ECC.

I would like to know the below,

1. If the PO has already been invoiced, and then we want to take the PO to SUS system, Is it possible and why?

2. BP was updated after the PO was invoiced and then we want to have the PO to SUS portal, how can we do that. Do we need to make any setting to have XML generated in ECC.

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Thanks & Regards