We have disabled the ability to create item numbers on the fly from a work order.  However, if one presses enter when there is a blank space in the part number field, it takes you to the IN-B screen, only to say that this option has been disabled.  
 
My question is that shouldn't the system catch the blank item number first, without bringing up the extra IN-B screen (i.e. error message saying item number cannot be blank).