Alternative time-dependent component does not exist in table COMPALT

What causes this issue?

The following table entry contains an alternative time-dependent
component that was not created in the alternative components table
COMPALT.

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

Table/specific table keys:
See related information message.
Explanation of specific table keys
Plan number ~ operation ~ activity ~ log. component ~ material

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.