Hi, Knowlton - without coding it is not possible, nevertheless it is not too hard to add this check in Codeunit 80, Sales-Post, basically adapting the functions that are used in Form 342 Check Availability - you cannot directly call that Form from the posting codeunit, leads to an error… But watch out, Codeunit 80, is one of the most complex codeunits in Navision… Frank… I had a look at “Item Jnl.-Check Line” and this looks like a customization, because I couldn’t find that function. Saludos Nils