General maintenance task list for service product &1 cannot be integrated

What causes this issue?

You copied <DS:GLOS.3578FDB1FCD570FEE10000009B38F984>service product</>
&V1& to the service order. A general task list is assigned to this
service product in table T399A. If service orders are created or
changed using BAPIs, then task lists cannot be integrated.

System Response

The system does not integrate a task list.

How to fix this error?

You can maintain operations manually.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.