Open Purchase order/pending vendor invocie

User have an open Purchase Order and when they are going to invoice it ends up in Pending invoice status and not allowing to post

Although PO status is “Confirmed” (Approval Status) and “Open Order” (Status)

What are the possible cause of this issue

ANY SUGGESTION / solution

Thanks in advance

Best regards

When it does not post what does it tell you?
Have you received it and do you need to?

If any invoice goes to pending invoice, it always shows error prior to it. Do you see any error generating?

I agree but not getting any error message

it lends in AP-vendor pending invoice form and not allow to post

What is the job status in invoice history and matching details form? If it is Error, you may look at the error text.