3337769 - Communication error in "Maintain Business Roles (New)" app upon search for Restriction Values

In the new app for "Maintain Business Roles", the search functionality when maintaining restrictions for Key figures fails with error:

• Communication error<?xml version="1.0" encoding="utf-8"?><error xmlns="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"><code>XXXXXXXXXXXXXXXXXXXXX</code><message xml:lang="en">In the context of Data Services an unknown internal server error occurred</message></error> 

"Maintain Business Roles" search restriction "Key figure" "communication error" F1492 , KBA , BC-SRV-APS-IAM , Identity and Access Management , Problem