Migrated EP5 BW iViews get 500 response

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Symptom
Migrated BW iViews from EP5 content, which set the property ‘Cache Level’ to ‘User’, get 500 response status during runtime.
Other terms
EP5 content, migrated content, BW iView, 500 response, Cache Level
Reason and Prerequisites
Prerequisites:
Migrated BW iViews from EP5 content that run on portals later than EP5, and their property ‘Cache Level’ is set to ‘User’.
Reasons:
When the property [...]