SRM PO update for an ECC External requirement

Hi Experts,

We have a scenario in SRM where external requirements PR from ECC flow to SRM and creates a SRM SC, we have enabled SRM SC workflow in our system where user can edit the SC and after an approval PO is created by buyer.Once the PO is created by buyer , buyer makes some changes in PO like editing the price or adding the new line item. But these changes are not getting reflected to the ECC PO, SRM PO status is Ordered but PO is not getting updated in ECC.

I have checked all the Batch jobs and there is no issue in it.Please suggest how we can avoid this issue.

Thanks,

Ankur