Error in number range object for : Partner &1 line &2 sy-subcr &3

What causes this issue?

An "internal key for object" is to be generated for a new special
arrangement. This attempt failed in number range management.

System Response

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

How to fix this error?

Forward this error message to support.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.