Techn. installation/equipment &1 not allocated; it is marked for deletion

What causes this issue?

The technical installation or piece of equipment cannot be allocated to
the premise because the deletion indicator for the piece of equipment
is selected.

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?

Select a technical installation or piece of equipment for which the
deletion indicator is not selected, or deselect the deletion indicator
in the piece of equipment. Note that the piece of equipment must not
already be allocated to a premise.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.