2828840 - MyInbox integration of travel request and travel expenses approval not loaded; empty page

The tasks for travel and expenses approval and travel request approval show as expected in the workitem list in MyInbox. However selecting one of these tasks shows in empty page in the details area (empty task visualization). In the app the error message 'Could not load data. Contact your system administrator' or 'could not display data. Contact your system administrator' is displayed.

In the console there might be the messages 'Failed to load resource. The server responded with a status of 500' or 'No system alias assigned to user...' or 'Invalid key predicate: ...', or also others.

Travel Management on-premise solution.

MyInbox, travel requests, travel expenses, approve, empty, , KBA , FI-FIO-TV-ATR , Approve Travel Requests , FI-TV , Business Trip Management , FI-FIO-TV-ATE , Approve Travel Expenses , FI-TV-ODT-ATE , Approve Travel Expenses , FI-TV-ODT-ATR , Approve Travel Requests , Problem