Your client is attempting to purge closed purchase orders. They have run the Detail (F4311) Purge program (R4311P) and the F4301 Purchase Order Header Purge program (R4301P). However, some purchase order header records still exist for orders they insist are closed. You discover that they create purchase orders that include stock, nonstock, freight, and text lines.
What is causing the purchase order header records to remain in the system?