Appended table & is temporarily partially active

What causes this issue?

An append was activated for the table without the table itself having
been subsequently activated. The active version of the table is
therefore temporarily set to partly active status. The table will be
activated normally by the mass activating program at a later time.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.