Check number range interval (approaching interval end)

What causes this issue?

The end of the interval for number assignment (material documents or
reservations) has nearly been reached.

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?

INCLUDE NA_SYSADMIN1
INCLUDE MB_NA_NUMMERNKREIS_PFLEGEN

Error message extract from SAP system. Copyright SAP SE.