G/L Accoutn and Commitment Item Relation

Hi Experts,

I have a question about relation of G/L Account and Commitment Item.

Is it possible that one G/L account have relation with several Commitment Item? (1:N relation)

If I don't use derivaiton rule or G/L master data, Can I input the Commitment item manually?

Please clarify !

Rgds

KyungIn