The PO Schedule screen, here on the Purchasing menu, provides the means for monitoring supplier performance to insure that POs are received on schedule.
Here we are looking at all open PO line items that are not yet fully received. A value in the Days Past Due column indicates a late PO relative to its due date. In such cases you may wish to contact the Supplier to expedite the PO. Click the down arrow in the Supplier field to display the supplier contact information.
If the Supplier gives you a firm delivery date, change the Expected date to reflect the promised delivery date. This updates the master schedule to reflect the promised delivery date.
In summary, the key objectives of this process are to monitor late POs on a daily basis, to expedite late POs as needed, and to update the Expected date against late POs when the supplier gives you a firm delivery date.