SAP Netweaver EHP1 upgrade query

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Hi

We are trying to upgrade our SAP Netweaver 7.0 SR3 BI system to EHP1. We have SAP NW Java system in a different server where both ABAP and JAVA stacks communicate through RFC. My question here is that: Do we need to apply EHP1 for JAVA stack also as mandatory or its optional. If in a scenerio having ABAP stack on EHP1 and JAVA stack is still not on EHP1, would there be any inconsistencies??.

My other question : We have SAP NW BI Dev, quality and production systems. Suppose SAP NW BI Dev system is upgraded to EHP1 and rest of the systems still on NW 7.0, and while transporting change requests from Dev to quality and production, would there any inconsistencies. In a nut-shell, is it mandatory that all Dev,Qas and PRD systems need to be on EHP1.

Hope am clear with my doubts. Your response is highly appreciated.

Thanks,

Ramakrishna Reddy