Installation of ESS & MSS in SAP NW system, ECC 6.0 vs EP 7.0

Hi Expert,

I have a query regarding SAP_HR and ESS, MSS installation and thought to discuss with you.

I have gone throught this https://websmp107.sap-ag.de/~sapidb/011000358700001286271999E FAQ,

But I am still not clear.

Here is the scenirio:

We have ECC 6.0 EHP4 and EP 7.0 System

We have HR team.

Now I would like to apply ESS and MSS in EP 7.0 system with following component.

BPP ERP ESS 1.41 -Do I need to apply this compoennt in ECC system or EP system

BPP ERP MSS 1.41-Do I need to apply this compoennt in ECC system or EP system

PCUI GP 603-Apply in EP system

ESS 603- Do I need to apply this compoennt in ECC system or EP system

MSS 600-Do I need to apply this compoennt in ECC system or EP system

How ECC and EP would work if I deploy ESS and MSS in EP.

And also what is the relevance of EA_HR in ECC system if I already deploy ESS and MSS in EP system.

IF you need futher information,please feel free to reply back.

Thanks,

Manas