EHP1 upgrade of BI before EHP4 upgrade of ECC

Hello,

We have the following systems:

ECC on 7.0 SP12

BI on 7.0 SP12

Portal (recently updated to 7.01 SP06)

We plan to update our BI systems to 7.0 EHP1 SP06 before updating ECC to EHP4 for ERP. The plan is to update Dev, QA and Prod of BI to EHP1 SP06. And once this is done and tested, we plan to proceed with updating Dev, QA and Prod of ECC to EHP4. Do you see any issue in proceeding with this?

Is this the right way to do it, or should we update both BI and ECC together? or ECC first and then BI?

Please let me know how to proceed, your help is highly appreciated.

Thanks

Ajay