How To Fix BG018 - Number range does not allow external number assignment

BG018 - Overview

• Message type: E = Error

• Message class: BG - Warranty processing

• Message number: 018

• Message text: Number range does not allow external number assignment

What causes this issue?

Your system setup does not allow external number assignment.

System Response

The system assigns an internal number.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.

BG018 - Details

• The SAP error message BG018 indicates that the number range you are trying to use does not allow external number assignment. This typically occurs when you are attempting to create a document (such as a purchase order, sales order, etc.) using an external number that is not permitted by the configuration of the number range.
  
  Cause:
  
  Number Range Configuration: The number range for the document type you are trying to create is set to "Internal" only, meaning that the system generates the numbers automatically and does not allow users to input their own external numbers.
  Document Type Settings: The specific document type you are working with may have been configured to restrict external number assignment.
  User Authorization: In some cases, user roles and authorizations may restrict the ability to use certain number ranges.
  
  
  Solution:
  To resolve the BG018 error, you can take the following steps:
  
  
  Check Number Range Configuration:
  
  Go to the transaction code SNRO (Number Range Objects).
  Find