Must all SAP MSS, SAP ESS and SAP PCUI_GP be of the same SP level?

Hello,
in order to fix an error in XSS we need to upgrade SAP PCUI_GP to SP 10. Is it therefore necessary to upgrade also the rest of the components building XSS (SAP MSS and SAP ESS) also to SP 10 or can they stay on SP 9 as they are now? Is there an official SAP document answering my question?
Regards,
Adam

adam,
the MSS and ESS should work independently, but both require PCUI_GP as a base-component, so these versions should be equal.
you can try to use different SP-levels, but this is not supported & what's the problem to keep them on the same level?
depending on the changes on each SP-level (e.g. if there are only country-specific changes for countries you don't need or text-corrections, check the notes for the SP-levels) you can risk it...
kr, achim

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