material debit in miro with valuation type

Hello experts,

i tried to find the reason in following case in many online line search, could not solution.

CASE- miro document posted with po reference but no GR clearing amount pending. amount debited in material tab. here material is split valuated but SAP allowed to debit inventory without asking for the valuation type and credit to vendor. when i run the report MB5L this amount is not showing in this report. my question is

1. how system allowed to post miro document without valuation type

2. why this amount is not in MB5L report.

thanks