Reference to table & already exists

What causes this issue?

You want to link the <DS:GLOS.characteristic>characteristic</> to field
&v2& in table &v1&. However, the characteristic is already linked to
this table.

System Response

The system checks to ensure that there is only one link to each table.

How to fix this error?

Change your links such that there is no more than one link to each
table.

Error message extract from SAP system. Copyright SAP SE.