Subitem &1 does not exist; &3

What causes this issue?

<DS:GLOS.subitem>Subitem</> &V1& for
<DS:GLOS.subitem category>subitem category</> &V2& does not exist.

System Response

Status message. &V3&

How to fix this error?

Choose one option:
Define subitem &V1& for subitem category &V2&.
Delete the entry with item &V4& and subitem &V1& and, if required,
generate a new entry with existing subitem.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.