PO status is Incomplete after PO has been submitted for approval.

Hi,

We have setup a new purchasing responsibility for an operating unit. All the setups have been done.

I had created a PO and submitted it for approval. Post this I had submitted workflow background process (by called PO Approval Workflow) to approve the PO. But the status of PO changes to Incomplete.

Let me know the reason behind the same. Is there any setup missing ?

Thanks,

Krishna