How To Fix M8182 - Entry of an external document number not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: M8 - Invoice Verification/Valuation

• Message number: 182

• Message text: Entry of an external document number not allowed

What causes this issue?

Your system is configured in such a way that document numbers are issued
by the system. The field <LS>Document number</> must be left empty.

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

System Response

How to fix this error?

Delete the number in the field <LS>Document number</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M8182 - Entry of an external document number not allowed ?

  The SAP error message M8182, which states "Entry of an external document number not allowed," typically occurs in the context of material management or inventory management processes. This error indicates that the system is preventing the entry of an external document number in a situation where it is not permitted.
  Causes:
  
  Configuration Settings: The system may be configured to disallow the entry of external document numbers for certain transactions or document types.
  Document Type Restrictions: The specific document type you are trying to use may not allow external document numbers.
  User Authorizations: The user may not have the necessary authorizations to enter external document numbers.
  Transaction Context: The error may arise in specific transactions where external document numbers are not applicable, such as certain goods movements or inventory adjustments.
  
  Solutions:
  
  Check Configuration: Review the configuration settings in the SAP system for the relevant document types and transaction codes. Ensure that the settings allow for the entry of external document numbers if that is required.
  
  Transaction Code: SPRO (Customizing)
  Path: Materials Management > Inventory Management and Physical Inventory > Document Types > Define Document Types
  
  
  Review Document Type: Verify that the document type you are using supports external document numbers. If necessary, change the document type to one that does.
  User Authorizations: Ensure that the user has the appropriate authorizations to enter external document numbers. This may involve checking roles and permissions in the user profile.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on the transaction you are working with to understand the limitations regarding external document numbers.
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP support for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes that may be involved in the process, such as MIGO (Goods Movement) or MB1A (Goods Withdrawal).
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional insights or patches that address the issue.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to diagnose and resolve the M8182 error in your SAP system.