What is the exact procedure of upgrading the ESS/MSS

Hi,
We intially started with EP 7.0 sp13 and ESS/MSS version 600 SP10.Later on we upgraded to EP 7.0 SP13 and ESS/MSS to SP13.
we have done lot of customisations to SAP ESS/MSS standard code and we did them again when we upgraded ESS/MSS.
Again we are planning to upgrade Portal to another version .so here my doubts are
1.Is it necessary to upgrade ESS/MSS everytime we upgrade portal(because ESS/MSS version = Portal version - 3 )
2.Do we need to do all the customisations again manually?
3.Is there anyway we can create copy of all the DCs which we want to customise and then do the customisations so that we dont need to redo all the work whenever we upgrade ESS/MSS
Thanks
Bala Duvvuri

Bala,
Usually, there are 3 (+1 ) types of patches that are done:
1. Kernel and JDK. This one is easy, can be done often. Affects perfomance, but rarely functionality.
2. Netweaver SPS. This one will update basic functionality, but in most cases will not affect ESS. Also can be done every 3 month.
3. ERP SPS. This one will affect ESS. You will be required to go through the cookbook. Backend HR component versions must match EP XSS. It makes sense, because EP XSS will call backend BAPIs and they should be of the same versions. Not very often I see ERP SPS applied every 3 month. One of the reasons is that user UI screens and procedure may change and the cycle of testing and user training rarely fits into 3 month.
+1. EHP, Enancement Packs. This is SAP effort to give a more granular aproach to functional changes. Basically your functional team will decide if it needs a new function and it will be possible to implement and activate it. If it happens that the function is HR and it affects XSS and it brings a new version, then yes, you will need to do XSS merge-update. It will be clear from the EHP docs. How often to do ESS related EHP? See 3. Keep in mind that EHP docs may give an impression that there is no impact until you "turn on" new function, but it is true for ABAP (with some exceptions), less so on the Java side.
Regards,
Slava

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