Impact of Changing User Types

What is the impact of changing user types from 'service' user type to either a 'communication' or 'system' user type?  Will the change stop authorizations or will it only affect administration?  Is the change related to the available fields or locking security and not necessarily related to authorizations.

Which release are you on?
It also depends on your config => rejecting expired passwords, compliance with current password policies (at logon...) and same user context for RFC calls.
You should first investigate why it is a "SERVICE" type user. If it is from a config wizard with a profile delivered by SAP, then there might be a good reason for this.
The authority checks on "SERVICE" and "SYSTEM" users are the same, except that "SYSTEM" users are not SAPGui capable. This is not only restricted to the SAPGui logon screen. And for all logon types, they are excempted from changing their password - both via the requirement to do so and the ability to do it voluntarily...
But if they can administrate themselves, then they can (authorization object S_USER_GRP).
The same cannot be said for "COMMUNICATION" type users. I recommend not using them at all and there are many SAP notes which correct standard config wizards to use the correct user type => SYSTEM.
"COMMUNICATION" users are "DIALOG" users, except that when you enter the correct password via the SAPGui logon screen, then a message is returned to inform you that the user type cannot logon from that screen. But other screens will work, if the first screen is skipped.
You can test this with transaction OBVU in the standard system, or any other Z-transaction of the same ilk.
Cheers,
Julius

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