Tanmay,
Based on the info I read, why would you opt for an implicit enhancement? There are enough user exits thru which you should be able to achieve this if you spend a little time in understanding when these exits are called.
I am assuming this is a custom condition that you are trying to populate with some data present in a Z table. If this is the case why don't you try using one of the pricing prepare user exit in MV45AFZZ.
1. userexit_pricing_prepare_tkomK
2. userexit_pricing_prepare_tkomp
Implicit enhancement are very risky if you dont spend enough time analyzing the downstream process. You need to absolutely make sure that the code you put it will not affect standard SAP processing.
V.