Unable to Transfer interco AP transaction to payables

Summary:

We are unable to create the AP invoice for an intercompany batch. The AR transaction was successfully transferred to receivables but the transfer to AP fails due to the error :

You must enter a valid supplier and supplier site.

We already check the supplier and its site is ACTIVE.

It also have the PRIMARY PAY box checked at the supplier site assigned to the BU.

However, we are still unable to transfer it to the payables and close the period.

Please advise.

Version (include the version you are using, if applicable):

Oracle Fusion Cloud Applications25D (11.13.25.10.0)

Code Snippet (add any code snippets that support your topic, if applicable):