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Open the authorization user group with the plus sign, then you can select the authorization user group sub groups, here are the list with the record access rights.
Implementation order
When implementing horizontal access rights on an existing system, we recommend using the following order, this prevents that during the implementation certain records are no longer visible or can be controlled by system users who still need to be able to do so.
Create the record access right records.
Create the authorization groups.
Link the record access right records to the desired authorization groups.
Create the authorization user groups
Link the record access right records to the desired authorization user groups.
Link the desired authorization user group to the system users.
Link the authorization groups to the records in the system that should become invisible to certain system users