I'm still new to NAV...
I would like to change the sorting of page 1007 ("Job Planning Lines) to be "Job No.,Job Task No.,Planning Date, Line No." descending. So I add "Planning Date" in the primary key of table 1003 ("Job Planning Lines") and add the key on page 1007 property SourceTableView and setting it to "Descending".
It works fine, but when the user presses "New", NAV shows the error "The lines cannot be split".
How do I sort the lines the way I want, without causing problems for the "New" functionallity?