How To Fix /ISDFPS/MM596 - It is not possible to change the items of an EPA/HU purchase order

SAP Error Message - Details

• Message type: E = Error

• Message class: /ISDFPS/MM -

• Message number: 596

• Message text: It is not possible to change the items of an EPA/HU purchase order

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /ISDFPS/MM596 - It is not possible to change the items of an EPA/HU purchase order ?

  The SAP error message /ISDFPS/MM596 indicates that it is not possible to change the items of an EPA (External Procurement Agreement) or HU (Handling Unit) purchase order. This error typically arises in the context of managing purchase orders that are linked to specific handling units or agreements that have restrictions on modifications.
  Cause:
  
  Status of the Purchase Order: The purchase order may be in a status that does not allow changes. For example, if the order has already been delivered or invoiced, modifications may be restricted.
  Document Type Restrictions: Certain document types in SAP may have restrictions on changes after a certain point in the procurement process.
  Handling Unit Management: If the purchase order is linked to handling units, there may be specific rules or configurations that prevent changes to the items.
  Authorization Issues: The user may not have the necessary authorizations to make changes to the purchase order.
  
  Solution:
  
  Check Purchase Order Status: Verify the status of the purchase order. If it has been delivered or invoiced, you may need to create a new purchase order or use a different process to make the necessary changes.
  Review Document Type Settings: Check the configuration of the document type used for the purchase order. Ensure that it allows for changes as per your business requirements.
  Handling Unit Configuration: If the purchase order is associated with handling units, review the handling unit management settings to see if there are restrictions on changing items.
  User Authorizations: Ensure that the user attempting to make the changes has the appropriate authorizations. If not, contact your SAP security administrator to request the necessary permissions.
  Consult SAP Notes: Check for any relevant SAP Notes or documentation that may provide additional insights or solutions related to this error message.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for more details on handling purchase orders, handling units, and external procurement agreements.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ME22N (Change Purchase Order) and ME23N (Display Purchase Order) to navigate and troubleshoot purchase orders effectively.
  
  If the issue persists after following these steps, it may be beneficial to involve your SAP support team or consult with an SAP expert for further assistance.