How To Fix /ISDFPS/MM420 - Serial number &1 not found for PReq item &2 &3

SAP Error Message - Details

• Message type: E = Error

• Message class: /ISDFPS/MM -

• Message number: 420

• Message text: Serial number &1 not found for PReq item &2 &3

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.

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 /ISDFPS/MM420 - Serial number &1 not found for PReq item &2 &3 ?

  The SAP error message /ISDFPS/MM420 Serial number &1 not found for PReq item &2 &3 typically occurs in the context of materials management and inventory management, particularly when dealing with serial numbers in the SAP system. This error indicates that the system is unable to find the specified serial number for a particular purchase requisition (PReq) item.
  Cause:
  
  Missing Serial Number: The serial number specified in the error message does not exist in the system for the material associated with the purchase requisition item.
  Incorrect Serial Number: The serial number may have been entered incorrectly, leading to a mismatch.
  Material Master Settings: The material may not be set up to manage serial numbers, or the serial number management settings may not be configured correctly.
  Document Status: The purchase requisition item may be in a status that does not allow for the processing of serial numbers.
  Data Inconsistency: There may be inconsistencies in the data between the purchase requisition and the inventory records.
  
  Solution:
  
  Verify Serial Number: Check the serial number entered in the transaction. Ensure that it is correct and exists in the system.
  Check Material Master: Ensure that the material associated with the purchase requisition is set up for serial number management. You can do this by checking the material master data in the relevant views (e.g., Basic Data, Purchasing, and Plant Data).
  Review Purchase Requisition: Look at the purchase requisition item to ensure it is in a valid status and that all necessary data is complete.
  Check Inventory Records: Use transaction codes like IQ01 (Create Serial Number) or IQ02 (Change Serial Number) to check if the serial number exists in the inventory.
  Consult with IT Support: If the issue persists, it may be necessary to consult with your SAP support team or IT department to investigate further, especially if there are data inconsistencies or configuration issues.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ME53N (Display Purchase Requisition), MM03 (Display Material), and IQ01/IQ02 (Serial Number Management).
  SAP Notes: Check for any SAP Notes related to serial number management and purchase requisitions that may provide additional insights or patches.
  Documentation: Review SAP documentation on serial number management and purchasing processes to ensure compliance with best practices.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.