How To Fix CN318 - External network number & cannot be used more than once

CN318 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 318

• Message text: External network number & cannot be used more than once

What causes this issue?

You were trying to create several networks with the same external
number &V1&.

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?

+nter an external number for each network so that the assignment of
subordinate objects is unique.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN318 - External network number & cannot be used more than once ?

  The SAP error message CN318, which states "External network number & cannot be used more than once," typically occurs in the context of project management or network planning within SAP. This error indicates that the external network number you are trying to use has already been assigned to another network or project, and SAP does not allow the same external network number to be reused.
  
  Cause:
  
  Duplicate External Network Number: The primary cause of this error is that the external network number you are trying to assign is already in use by another network or project.
  Data Entry Error: It may also occur due to a simple data entry mistake where the same number is inadvertently entered multiple times.
  
  Configuration Issues: In some cases, configuration settings in the project system may lead to this error if the system is not set up to handle external network numbers correctly.
  
  
  Solution:
  
  Check Existing Networks: Verify if the external