How To Fix MM_PUR_SES150 - Updating the NetAmount field is not supported!

SAP Error Message - Details

• Message type: E = Error

• Message class: MM_PUR_SES -

• Message number: 150

• Message text: Updating the NetAmount field is not supported!

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MM_PUR_SES150 - Updating the NetAmount field is not supported! ?

  The SAP error message MM_PUR_SES150, which states "Updating the NetAmount field is not supported," typically occurs in the context of purchasing documents, such as purchase orders or invoices, when there is an attempt to modify the Net Amount field in a way that is not allowed by the system.
  Cause:
  
  Field Restrictions: The Net Amount field is usually calculated based on other fields (like quantity, price, discounts, taxes, etc.) and is not meant to be updated directly. This is a common restriction in SAP to maintain data integrity.
  Document Status: The document may be in a status that does not allow changes to certain fields, including the Net Amount.
  Custom Logic: There may be custom enhancements or user exits that restrict changes to the Net Amount field.
  Incorrect Data Entry: Sometimes, the error can arise from incorrect data entry or an attempt to save a document with inconsistent data.
  
  Solution:
  
  Review Document Changes: Instead of trying to update the Net Amount directly, ensure that the underlying fields (like item price, quantity, etc.) are correct. The Net Amount will be recalculated based on these fields.
  Check Document Status: Ensure that the document is in a status that allows for changes. If the document is already processed or completed, you may need to reverse or cancel it before making changes.
  Consult Custom Logic: If there are custom enhancements in your SAP system, consult with your ABAP developer or SAP Basis team to understand if there are any restrictions in place that prevent updating the Net Amount.
  Use Correct Transactions: Make sure you are using the correct transaction codes for the intended changes. For example, use ME22N for changing purchase orders rather than trying to edit fields directly in a report or display mode.
  SAP Notes: Check for any relevant SAP Notes that might address this issue. Sometimes, SAP releases notes that provide fixes or workarounds for specific error messages.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for purchasing and invoice processing for more details on how the Net Amount is calculated and the rules governing it.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ME21N (Create Purchase Order), ME22N (Change Purchase Order), and MIRO (Invoice Verification) to understand where and how to make changes.
  User Roles and Authorizations: Ensure that you have the necessary authorizations to make changes to purchasing documents, as restrictions may also be role-based.
  
  If the issue persists after trying the above solutions, it may be beneficial to reach out to your SAP support team for further assistance.