How to update Service Line Condition via Program

Hi,

I am trying to update conditions of service line in a service PO. Which we can see/update in PO transaction under Services Tab, below the table strip.

I am using BAPI_PO_CHANGE.

I am getting condition record no from ESLH table and using that condition record no in PO_COND to update / insert new condition for a service line.

But While executing somehow the BAPI is trying to update master pricing condition which comes under Condition tab of the item details.

So I need to know how can we achieve updating Service Line condition values via program.

Regards,

Sourav