Number range & is not defined as internal

What causes this issue?

The generation of sets of <DS:GLOS.consolidation_unit>consolidation
units</> uses number range &v1& of <DS:GLOS.number_range>object</>
"FIMC_SETNR". This number range is not set to "internal".

System Response

Processing terminated

How to fix this error?

Maintain number range &v1& in Customizing.

Error message extract from SAP system. Copyright SAP SE.