Your requirement is to change Read/Wirte access of a Business User. Upon trying to change the Read/Write access restrictions to Resticted/Unresticted the page keeps loading.
SAP Cloud for Customer
Reproducing the Issue
Go to Administrator work center
Select the Business Users view
Search and select the Business User X (where X represents the Business User)
Select 'Edit' -> Access Rights
Go to the Access Restrictions tab
For any work center view change the Write Access to 'Restricted' or vice versa
As soon as you change the restriction, the page keeps on loading.
This occurs when there are lots of access groups belonging to the selected access context code. System gives the time out error while creating the hierarchy among these access groups to show it on the screen.
As an alternative you can provide authorization to this Business User via Business Role using Restriction Calculation Rule.
Read, Wirte, Access, Restriction , KBA , SRD-CC-IAM , Identity & Access Management , Problem