How To Fix W5120 - Enter a vendor

SAP Error Message - Details

• Message type: E = Error

• Message class: W5 - Messages for MM-WEB Applications and BAPIs

• Message number: 120

• Message text: Enter a vendor

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message W5120 - Enter a vendor ?

  SAP Error Message:
  
  W5120 - Enter a vendor
  
  Cause:
  The message W5120 "Enter a vendor" appears when a vendor number is required in a transaction or screen, but the field is left empty or the system cannot find a valid vendor entry. This typically happens in purchasing or invoice-related transactions where the vendor must be specified to proceed.
  
  When does it occur?
  
  During creation or processing of purchase orders, goods receipts, or invoice documents.
  When the vendor field is mandatory but not filled.
  When the system expects a vendor number for validation or further processing.
  
  
  Solution:
  
  
  Enter a valid vendor number:
  
  Make sure to input a correct and existing vendor number in the vendor field.
  
  
  Check vendor master data:
  
  If you are unsure about the vendor number, use the search help (F4) to find the correct vendor or verify the vendor master data in transaction XK03 (Display Vendor).
  
  
  Ensure vendor is active:
  
  The vendor must be active in the system (not blocked or deleted).
  
  
  Check transaction logic:
  
  If the vendor field is not supposed to be mandatory in your business process, check if any custom validation or user exit is enforcing this requirement.
  
  
  Consult configuration:
  
  In some cases, the vendor field is mandatory due to configuration in the purchasing or financial module. Verify the settings in IMG under:
  
  Materials Management (MM) ? Purchasing ? Vendor Master Data
  Financial Accounting (FI) ? Accounts Payable
  
  
  
  
  Additional Information:
  
  Message Class: W5 (Vendor-related messages)
  Message Number: 120
  This is a warning message (W), so the system may allow you to continue after entering the vendor.
  If the message appears unexpectedly, check for custom enhancements or validations that might be triggering it.
  
  
  Summary:
  
  Cause: Vendor field is empty or invalid when a vendor is required.
  Solution: Enter a valid, active vendor number.
  Check: Vendor master data, transaction requirements, and configuration.
  
  
  If you provide the transaction code or context where this message appears, I can give more specific guidance.