PO item condition-Percentage

We can fetch Material PO item condition amount with condition type from KONV table but passing document condition number fetched from EKKO Table.

For example

1. Gross price(PBXX) is 100 INR and Qty is 10
2. Other charges(ZCHR) is 10% of Gross price
3. Hence Total will become 1100 INR

The moment we save PO…. PBXX gross price stored as 100 in the KNOV table as we expected…but Other charges(ZCHR) stored as 100 instead of 10. We need to fetch 10 for our report purpose .

How to fetch the percentage value 10 in the table? Is there any other table/logic available for the same?