create a report connected to different PBCS applications

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During a migration from on-premise Planning to PBCS, I encoutered a report that has two grids with connections to different on-premise applications. I know it is impossible to replicate on FR.

I don't want to move data from a Planning app to another, because data needs to be synchronized in real time. So, I thought the only possible way is to use EPRCS. Is it true? if Yes, Do you can share a doc on how to create a report with connection to different PBCS apps?

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