How To Fix /ISDFPS/FDPDAMPO508 - Cannot change quantity &2 of PReq item &1 to quantity &3

SAP Error Message - Details

• Message type: E = Error

• Message class: /ISDFPS/FDPDAMPO -

• Message number: 508

• Message text: Cannot change quantity &2 of PReq item &1 to quantity &3

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /ISDFPS/FDPDAMPO508 - Cannot change quantity &2 of PReq item &1 to quantity &3 ?

  The SAP error message /ISDFPS/FDPDAMPO508 indicates that there is an issue with changing the quantity of a Purchase Requisition (PReq) item. The message typically arises in the context of SAP's Demand Planning or Supply Network Planning modules, particularly when dealing with forecasted or planned quantities.
  Cause:
  The error message can be triggered by several factors, including:
  
  
  Quantity Constraints: The system may have constraints that prevent the change of the quantity due to existing commitments, allocations, or dependencies on other documents (like purchase orders or stock levels).
  
  
  Locked Documents: The PReq item may be locked by another user or process, preventing changes.
  
  
  Status of the PReq: The status of the Purchase Requisition may not allow for changes. For example, if the requisition is already converted into a purchase order or if it is in a status that does not permit modifications.
  
  
  Configuration Settings: There may be specific configuration settings in the system that restrict changes to certain quantities based on business rules.
  
  
  Data Inconsistencies: There could be inconsistencies in the data that prevent the system from processing the change.
  
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Document Status: Verify the status of the Purchase Requisition item. If it has been converted to a purchase order, you may need to make changes at the purchase order level instead.
  
  
  Review Locks: Check if the document is locked by another user or process. You can use transaction codes like SM12 to view and manage locks.
  
  
  Validate Quantity Changes: Ensure that the new quantity you are trying to set does not violate any business rules or constraints. Check for any dependencies or allocations that might be affected by the change.
  
  
  Consult Configuration: If you have access, review the configuration settings related to Purchase Requisitions in your SAP system. There may be specific rules that need to be adjusted.
  
  
  Error Logs: Check the application logs for more detailed error messages that might provide additional context on why the change cannot be made.
  
  
  Contact Support: If the issue persists and you cannot identify the cause, consider reaching out to your SAP support team or consulting the SAP community for further assistance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ME53N (Display Purchase Requisition), ME52N (Change Purchase Requisition), and ME51N (Create Purchase Requisition).
  SAP Notes: Search for SAP Notes related to this error message in the SAP Support Portal, as there may be specific patches or updates that address known issues.
  Documentation: Review SAP documentation related to Purchase Requisitions and Demand Planning for best practices and guidelines on managing quantities.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.