How To Fix WN851 - Only one transportation chain of type &1 can be assigned

SAP Error Message - Details

• Message type: E = Error

• Message class: WN - Plant master data maintenance (integrated)

• Message number: 851

• Message text: Only one transportation chain of type &1 can be assigned

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 WN851 - Only one transportation chain of type &1 can be assigned ?

  The SAP error message WN851 indicates that there is an issue with the assignment of transportation chains in the system. Specifically, it states that only one transportation chain of a certain type can be assigned to a particular object (like a delivery or shipment). This error typically arises in the context of logistics and transportation management within SAP.
  Cause:
  
  Duplicate Assignment: The error usually occurs when there is an attempt to assign multiple transportation chains of the same type to a single object. For example, if you are trying to assign more than one transportation chain for a specific delivery or shipment, the system will throw this error.
  Configuration Issues: There may be configuration settings in the SAP system that restrict the assignment of multiple transportation chains.
  Data Integrity Issues: There could be inconsistencies or errors in the master data or transactional data that lead to this situation.
  
  Solution:
  
  Check Existing Assignments: Review the existing transportation chains assigned to the object in question. Ensure that there is only one transportation chain of the specified type assigned.
  Remove Duplicate Assignments: If you find that there are multiple transportation chains assigned, you will need to remove the duplicates. This can usually be done through the relevant transaction codes in SAP (e.g., VL02N for deliveries).
  Review Configuration: If the issue persists, check the configuration settings related to transportation chains in the SAP system. You may need to consult with your SAP Basis or configuration team to ensure that the settings align with your business processes.
  Data Validation: Ensure that the master data and transactional data are consistent and correct. This may involve checking the relevant tables and records in the SAP database.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as VL01N (Create Outbound Delivery), VL02N (Change Outbound Delivery), and others related to transportation management.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP Notes can provide additional insights or solutions.
  Documentation: Review SAP documentation related to transportation management and logistics execution to understand the expected behavior and configuration settings.
  
  If the problem persists after following these steps, it may be beneficial to engage with SAP support or your internal SAP team for further investigation.