How To Fix W_CB121 - Item number &1 was assigned twice in one document

SAP Error Message - Details

• Message type: E = Error

• Message class: W_CB -

• Message number: 121

• Message text: Item number &1 was assigned twice in one document

What causes this issue?

When creating a chargeback request, numbers that must be unique within a
document are assigned for the items. Item number &V1& was assigned twice
for one document.

System Response

The document cannot be created as the item number is not unique.

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.

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 W_CB121 - Item number &1 was assigned twice in one document ?

  SAP Error Message:
  
  W_CB121 - Item number &1 was assigned twice in one document
  
  Cause:
  This warning message occurs when the same item number is assigned more than once within a single document. In SAP, each item in a document (such as a sales order, delivery, billing document, or material document) must have a unique item number. Duplicate item numbers violate this rule and cause the system to raise this warning.
  Common scenarios causing this error include:  
  
  Manual entry errors where the user accidentally reuses an item number.  
  Custom programs or interfaces incorrectly assigning item numbers.  
  Data migration or upload errors where item numbers are not properly incremented or checked.  
  Copying documents without adjusting item numbers.
  
  
  Solution:
  
  
  Check the Document Items:
  
  Review the document in question and verify the item numbers. Ensure that each item has a unique number.
  
  
  Correct the Duplicate Item Numbers:  
  
  If the document is being created manually, change the duplicate item number to a unique one.  
  If the document is created via a program or interface, debug or review the logic that assigns item numbers to ensure uniqueness.
  
  
  
  Use SAP Standard Functionality:
  
  SAP usually automatically assigns item numbers sequentially. Avoid manual overwriting unless necessary.
  
  
  Data Upload / Migration:
  
  If the error occurs during data upload, check the source data for duplicates and correct them before upload.
  
  
  Check Custom Code:
  
  If custom enhancements or user exits are involved in item number assignment, review and fix the logic.
  
  
  
  Related Information:
  
  Message Class: W_CB121  
  Transaction Codes: VA01 (Sales Order), VL01N (Delivery), VF01 (Billing), MIGO (Goods Movement) — depending on the document type.  
  SAP Notes: Search for notes related to duplicate item numbers in the specific module you are working with.  
  Debugging: Use transaction SE91 to view the message details and SE38/SE80 to check any custom code related to item number assignment.
  
  
  Summary:
  The error "Item number &1 was assigned twice in one document" means that the same item number appears more than once in a document, which is not allowed. The solution is to ensure all item numbers are unique within the document, either by correcting manual entries, fixing interface logic, or cleaning up data uploads.
  
  If you provide the specific document type or transaction where this error occurs, I can give more tailored advice.