SAP PI 7.31 Dual Stack to PO 7.4 Upgrade Path

Hello All,

We are in the process of analysis phase for PI 7.31 Dual stack to PO 7.4. So I understand that there is no in-place upgrade available for dual to single stack and which means that I have to standup a new system for each PO 7.4 dev, QA and Prod. Will bring in ESR objects using Transport and ID objects thru migration tool.

Now the main thing that we are discussing is the upgrade path. I have outlined two aproaches below. I am incling towards approach one i.e move objects from dev to dev, qa to qa and prod to prod and only move upgrade fixes (replacment for ABAP mappings, BPM etc) from dev PO to QA PO to Prod PO.

Please let me know your thoughts and the approach followed in your environment.

Thanks,
Ashish