In PR to PO

Hi gurus,

i am trying to develop a scenario to get the Service level time taken from PR to PO

so in that i have two datasources like

2lis_02_itm and 2lis_02_scl which are having PR no and PR itm so i am a bit skeptical which datasource to use so that i can enhance further PR related fields from EBAN...

can somebody give me their thoughts on which is the good candidate.

thanks and regards

Sreedhar