But I have selected the order from the dropdown, but still not showed up in the list if the Purchase Invoice is created new, not from Purchase Order’s Copy To…
Maybe I am misunderstanding you, due to your habit of not showing relevant screen shots. Post a screen shot of the Edit screens of a purchase order and its corresponding purchase invoice. Then—and only then—post a screen shot of the Purchase Invoices tab listing that does not show the information you believe it should.
My answer in post #2 could have been more thorough. The two different Order fields have different effects:
When the dropdown field after the supplier’s name on the purchase invoice is sued to select a purchase order, the status of that purchase order is automatically updated in the Purchase Orders tab. And the purchase order number shows in the Purchase Invoices tab listing.
When the purchase order number is entered manually in the field after the Purchase Invoice date, due date, and reference number, the purchase order status is not automatically updated. But the purchase order number is still displayed in the Purchase Invoices tab listing.
In other words, no matter how you enter the purchase order number, it will be displayed in the Purchase Invoices tab listing. But where you enter it controls whether or not status is updated in the Purchase Orders listing.
The fact that some of your purchase invoices do not show any purchase order number suggests that somehow you are either not entering them or you are deleting them. That is why screen shots of Edit screens are so important.
See this post and the posts mentioned within. Most of the ‘problems’ are already present and answered so the first thing to do is search the forum (after reading the guides).
Look at the Edit screen of your purchase invoice again. Your screen shot shows that PO220403 was selected. If PO1000 was selected, it would be highlighted in the dropdown box.
A purchase invoice linked to PO220403 does show up on your list. I understand what you are saying about the mouse being dragged over a selection. But when I try to replicate the behavior you describe, the highlighted field is the selected field. Post a screen shot without activating the dropdown. In other words, show a screen shot of the Edit screen without touching anything.
I accept that what you say is true. But I still cannot replicate the behavior. So I cannot classify this as a bug. I recommend that you make a backup of your business. Then delete the transactions involved and re-enter them. Perhaps something was corrupted somewhere.