Hi,
Month end activity in SAP MM includes :-
1. Post all pending Good receipt ( recommended )
2. Post pending Goods Issue MIGO/MB1A/ - Recommended
3. Close MM Period
4. If required Carry out physical stock varification with system
Document type we have for PO :-
We have standard 5 document type but we can create N number of DOC type dependent on client requirement there is no restriction in number of Doc types.
Thanks,
Neha Bais