Private Supplier created with Payment Proposal but not with Invoice (DSN)

Hi team,

We have enabled Payment Proposal & ERP-Initiated invoices from SAP to be sent to DSN.

I have noticed that with the transaction Payment Proposal, even if there are no active relationship with suppliers, the system accepts the transaction and it creates a payment proposal.

For Invoices it is different : if there are no active relationship with suppliers, the transaction is blocked in CIG.

What can we do in order to create a Private Supplier when we send a ERP Initiated invoice to DSN ?

See screen shot with Private Suppliers created with Payment Proposal:

Thank you

Regards