Hi Erdem,
the Eu1/Eu2 info from the SAC URL isn't really an indicator of physical technical "stack" pointing to a datacenter, it's just a region label.
what i mean to say is, there are many hana systems, hosting many SAC tenants, in many different physical datacentre installations. it's not uncommon for there to be slight variations between update groups.
as already pointed out, some of your customers may be in a 2-week update frequency, others may be in a quarterly cycle. some customers also ask for an exceptional pause to the update cycle, for xyz reasons (rarely granted!).
In very rare circumstances, the upgrade may not be completed in the given maintenance timeframe, then the wave update is held until the next service opportunity.
Moreover, if you are a partner or have accessed a sap demo system - you will undoubtedly be on an earlier update group - 1 week or 2 ahead, respectively, of the public cloud edition.
Hope this helps.
Kind regards,
H
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