What is your main goal?

Could you describe it in more detail?

If you refer to the “Part Main Group” from main part you won’t find it.

This will be a big modification if you need it.

Why more detail : 

Somebody use a voucher type call FNP with the group function 0 - Purchase Non Inventory and integrate a voucher with an STDVOU template file which is normally reserved for voucher which are set with a group function M - manual voucher / R - Interim voucher / Q - Opening balances. 

So my question is : how it can be possible to integrate manual voucher which is set with a group function 0 - purchase non inventory? Why we are not normally blocked in this case? 

I know that function group are use to be use in specific process flow and when it’s manual then we have only the possibility to use or set the right function group to the voucher type to be able to use it. 

But when we use external file why we don’t have this control?