Hi Vijay,
How to find the last day of the month by the given date
This was already discussed here. I'm sure there are other solutions as well (like LAST_DAY - SAP HANA SQL and System Views Reference - SAP Library). Please do search before asking.
and
Do i need to first convert all the materials before adding up the amounts for th fisc period as they belong to different months??
I honestly still don't understand what you want to do. Convert all materials? You'll have to be a lot more specific here as requested on my first reply.
BRs,
Lucas de Oliveira