How To Fix CMT2191 - & does not support external number assignment

SAP Error Message - Details

• Message type: E = Error

• Message class: CMT2 - Add-On Version: Message Class in CM Environment

• Message number: 191

• Message text: & does not support external number assignment

What causes this issue?

You want to create a new object in configuration management. However,
only certain number ranges are reserved in the system, which allow
external number assignment.
&V1& is in a number range that does not allow external number
assignment.

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?

Choose a number for which external number assignment is possible.
For an overview of the various number ranges, see Customizing
(Configuration Management).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CMT2191 - & does not support external number assignment ?

  The SAP error message CMT2191 typically indicates that there is an issue with the number assignment for a particular object or document in the system. The message "does not support external number assignment" suggests that the system is configured to use internal number assignment for the specified object, but an attempt has been made to use an external number.
  Cause:
  
  Configuration Settings: The system is set up to use internal number assignment for the specific document type or object, but an external number is being provided.
  Document Type Restrictions: Certain document types in SAP may not allow external number assignment due to their configuration.
  User Input Error: The user may have mistakenly tried to enter an external number when the system is expecting an internal one.
  
  Solution:
  
  
  Check Configuration:
  
  Go to the configuration settings for the relevant document type or object in SAP.
  Verify whether the number assignment is set to "Internal" or "External". If it is set to "Internal", you will need to either change the configuration (if appropriate) or use the internal number assignment method.
  
  
  
  Use Internal Number Assignment:
  
  If the system is configured for internal number assignment, ensure that you are not trying to manually enter an external number. Instead, let the system generate the number automatically.
  
  
  
  Adjust Document Type Settings:
  
  If you need to use external number assignment, you may need to change the settings for the document type in the configuration. This typically requires access to the SPRO transaction and the appropriate authorizations.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation or help files related to number assignment for the specific module you are working with (e.g., FI, MM, SD) to understand the implications of changing number assignment settings.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue through configuration changes or if you are unsure about making changes, consider reaching out to your SAP support team or SAP directly for assistance.
  
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like SPRO (for configuration) or OBA7 (for number range management) to check and modify settings.
  Documentation: SAP Help Portal and community forums can provide additional insights and user experiences related to this error.
  Testing: After making any changes, ensure to test the functionality in a development or quality assurance environment before applying changes to the production system.
  
  By following these steps, you should be able to address the CMT2191 error and understand the implications of number assignment settings in your SAP system.