When a drawing revision is added to an Item under IN-B (Enter Inventory) there will be the error "The VALID expression returned false.  The entry must be done again." and the window will close.  If you try to change the drawing again, when you hit Exit on the ECO Drawing Maintenance window all windows will close instead of taking you back to the IN-B Enter Inventory window.  If you go back to the item, the drawing will not have changed.  The "fix" we've been using is to close DBA after the error and everything works like it should.  Any ideas?