Can we post any goods movements for current period with out doing CKMLCP for previous Period.?

Dear Experts,

Please let me know

1.Can we post any goods movements for current period with out doing CKMLCP for previous Period.? if no, what are the issues we may face?

2. Valuation of material 000000001 in valuation area XXXX inconsistent

The system determined an inconsistency in material 0000000001 in valuation
area XXXX for period 006. The valuation data contained in the material ledger
differ from that in the material master.

What are the causes for material Inconsistencies between valuation area and material ledger.

Thanks in advance

Thanks

kik