How To Fix WS091 - Item number & already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 091

• Message text: Item number & already exists

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WS091 - Item number & already exists ?

  SAP Error Message:
  
  WS091 - Item number & already exists
  
  Cause:
  This error occurs when you try to create or add an item with an item number that already exists in the document or transaction. In SAP, item numbers within a document (such as a sales order, purchase order, or delivery) must be unique. Attempting to reuse an existing item number causes this error.
  
  When does it typically occur?
  
  While creating or modifying sales documents (e.g., sales orders, deliveries).
  During purchase order creation or change.
  When manually entering item numbers instead of letting SAP assign them automatically.
  When copying documents and item numbers clash.
  
  
  Solution:
  
  
  Check the item number you are trying to enter:
  
  Ensure that the item number is unique within the document. Do not reuse an existing item number.
  
  
  Use automatic item numbering:
  
  Let SAP assign item numbers automatically instead of manually entering them, unless there is a specific business need.
  
  
  If copying documents:
  
  When copying documents, verify that item numbers do not conflict with existing ones in the target document.
  
  
  Adjust item numbering logic (if customized):
  
  If your system uses custom logic or user exits to assign item numbers, review the logic to prevent duplicates.
  
  
  Check for user input errors:
  
  Sometimes users accidentally enter the same item number twice.
  
  
  
  Related Information:
  
  Transaction codes: VA01/VA02 (Sales Order), ME21N/ME22N (Purchase Order), VL01N/VL02N (Delivery)
  Tables involved: VBAK (Sales Document Header), VBAP (Sales Document Item)
  SAP Notes: Check SAP OSS notes for any known issues related to WS091 in your SAP version.
  Customization: Item numbering can be influenced by user exits or BAdIs such as USEREXIT_NUMBER_RANGE or BADI_SD_SALES_DOCUMENT_SAVE.
  
  
  Summary:
  WS091 indicates a duplicate item number in a document. To resolve it, ensure item numbers are unique, preferably by allowing SAP to assign them automatically, and verify any custom logic that might cause duplicates.
  
  If you provide the specific transaction or scenario, I can help with more tailored advice.