Upgrade MDM 5.5 portal content from SP6 to MDM 7.1

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Symptom
After upgrading the MDM Server and its repositories from MDM 5.5 SP6 to MDM 7.1, the portal MDM iViews show runtime errors.
Other terms
MDM 5.5 55 7.1 7.10 710 SP6 SP06 Upgrade iView portal content UWL Universal Worklist Workflow
Reason and Prerequisites
Reason
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The version of portal content must match the version of back-end MDM Server.
The mapping of portal [...]

MDM Portal Content deployment fail – MDM 7.1 SP02

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Symptom
You are trying to update your MDM Portal content or the MDM Java API to MDM 7.1 SP02 Patch03 or a higher version and receive the following deployment error:
SDM has not calculated any deployment actions.
Possible reasons:
All selected archives have already been deployed before in the same or in a higher version.
Other terms
MDM, Portal, SRM-MDM, [...]