I'm using the following code in the SPEPOH script, which checks if the purchase order is fully signed. If so, the delete button should be disabled.

It works sometimes, however when I select a different order in the left menu that is fully signed and receipted, then back to an order that is only fully signed, it allows me to delete, until I select the item from the list again?

Any ideas why this would be happening?

The following is the code used:

$SETBOUT
  If [F:POH]APPFLG = 3 and [M:POH1]APPFLG = 3
    Disable GSTAANU
  Elsif [F:POH]APPFLG <= 2 and [M:POH1]APPFLG <= 2
    Enable GSTAANU
  Endif
Return