Release strategy & Tolerance issue in PO

Hello !

We are facing  an issue please provide solution for the below scenario.

We are using release strategy for only PR, not for PO and we are using upper tolarence limit 10% for PO.

scenario is like below:

PR: 1000 $ and approved.

PO: 1000 $

then again PR value changed to 1200$ and  not approved.

in PO also changed with the same value 1200$. But here system shoud through errors like PR not yet approved and tolanrece error.

Please guide me how to proceed.

Thanks,

AMD