ABAP simple question on std sap report

Hi, thanks for this ABAP team on sdn. but please clarify 1. execute the table TRDIR with appl = M it gives the program list but when i copy the program name in se38 lets say program = /BEV3/FMCVFTOP_000002 then it say cannot generate so this means some of them are not report

can u suggest what is the start of tech name or identification to say that this program is a report so that i only execute the report and do not waste time on which are not report also if there is any way to find the report name from this TRDIR LIST

2. is any of ur team make such program that will fill application wise like M or F and have the filter set and give the list of report with report name

Please help

thanks

soniya