In Container Maintenance, a PO shipment (venture) is not available, even though the PO shipment is issued. How can I find out why the PO shipment is not available?

Use Venture Explorer to see the status of the venture. If you are not sure what the status is, make sure you check the status checkboxes at the top. One possible reason why the venture is not available is that it the venture is closed (goods have been sold, invoiced), Venture Explorer will confirm this