Hi Ziad,
We found your company's registration in our database. Thank you. We only have you for version 6.2B (971212), but that won't influence this issue.
The above recommendation is to edit the actual report and change the date in the selection formula to Feb 29/2000, save, and recompile the report. Perhaps you can compile to a new file name so that you do not overwrite the current one, and use this temporary executable until it is no longer necessary.
The problem with the leap date occurs only if you have the 'Modify Selection Formula' checkbox marked, bringing up the date information and Feb 29,2000. If you already have Feb 29,2000 in the selection formula, in addition to any other parameters, and run the compiled report without modifying the selection formula, it will print OK without any date errors. I suppose this is a temporary workaround until you no longer require the leap day in the runtime selection.
Alternately, you can run the report from the main program, rather that the compiled report.