Activation of Dictionary objects during upgrade phase not possible

What causes this issue?

An upgrade to a new version is currently running in your SAP system.
Dictionary objects may not be activated in the current upgrade phase.

System Response

The action is not carried out.

How to fix this error?

Wait for the ACT phase of the upgrade to finish. You can then activate
again.
You can find more information in the upgrade guidelines.
In particular, read the section on adjusting ABAP Dictionary objects.

Error message extract from SAP system. Copyright SAP SE.