SAP Message 56306 - Assigned number is in critical range (-> percent in TNRO)

Diagnosis
Using the transaction 'SNRO', a critical area can be specified for eachnumber range object as a percentage. If the system recognizes that thisarea has been reached during number assignment, an error messageappears. It informs the user that the end of the number range will soonbe reached.

Procedure
Inform your system administrator that the number range has reached thecritical area.

Procedure for System Administration
The number range interval must be extended or trips must be archived.