Scheduling a report on Monthly Basis

Hi all,

There is one report which is scheduled on daily basis, and running very smooth.

but now i need to schedule this report on MONTHLY basis, this option i don't find in Job Queue Entry.

up till now i have added two fields in Job Queue entry table 

Monthly ---boolean and

Start Month/End --- Date Time.

i  modified the code in codeunit - Job Queue Dispacher according to the two new fields but did not worked.

Please help !!!

Thanks,

Amol