Sales Order Processing

When I enter an order I change the Actual Ship Date field on each line item to what I want it to be. I then transfer the order to an invoice. When I look at the newly created invoice, the Actual Ship Date is changing back to the User Date. This used to work fine. I logged into a different company to test and it works fine there. I have already run Check Links (File-Maintenance-Check Links) on the Sales Series. How can I resolve this?

The Order and/or Invoice Type ID’s may be corrupted/damaged. Set up a new Order ID under Setup-Sales-Sales Order Proc-Order Button. Then test entering an order, changing the Actual Ship Date and transfer the Order to an Invoice. If it still does not work correctly, set up a new Invoice ID under Setup-Sales-Sales Order Proc-Invoice Button. Then test the scenario again.