Purchase order commitment vs real

Hello,

I'm having a problem I would like to ask for your help.

I need to see for a purchase order the transfers from commitment to real in order to check deviations for the

commitment.

I am not being able to see this information. My idea was to be ale to compare which postings changed the

total amount for certain project because there were differences between commitments and real postings.

Thanks for your

help
Alberto