use an outer join from the incident table to the other tables. The outer join will allow all the incidents that exist in the date range to print, and if there are other details that exist they will print, as opposed to the inner join where only the incidents with other information will print.
to change the join, right click on the link on the link tab, and 'select link options'. If drawn from teh incident table to the relatioin table to the other table, you would be using Left Outer Joins.
I'm not sure about the Enforce Join...I do all my selecting in SQL stored procs so I am not sure how exactly this works... you might want to search for some of DBlank's post as they explain this option (sometimes).
HTH