Functional location &1 assembly &2 already contained in object list

What causes this issue?

You have tried to enter a <DS:GLOS.functional_location>functional
location</> and an <DS:GLOS.assembly>assembly</> in the
<DS:GLOS.object_list>object list</> which are already contained in the
object list.

System Response

INCLUDE KEINE-FUNKTION OBJECT DOKU ID TX LANGUAGE EN

How to fix this error?

Delete the entries from the object list.

Error message extract from SAP system. Copyright SAP SE.