How To Fix ARUN_MAIN004 - Item &1 is assigned; &2 cannot be changed (see long text &3)

SAP Error Message - Details

• Message type: E = Error

• Message class: ARUN_MAIN -

• Message number: 004

• Message text: Item &1 is assigned; &2 cannot be changed (see long text &3)

What causes this issue?

The material is relevant to Supply Assignment (ARun) and an assignment
exists for this document item.
You cannot change the document item for one of the following reasons:
The unassign rule field check is set to <ZK>Error </>in Customizing
under <LS>Cross-Application Components > Advanced Available-to-Promise
(aATP) > Supply Assignment (ARun) > Cross-Applications</>.
The item is already assigned; therefore, the material cannot be changed.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

You can set the field check from Error to one of the following options.
N = No Action
W = Warnings Before an Order is Unassigned
For application types (purchase orders, inline confirmations, and
inbound deliveries), you can set the Customizing under <LS>Cross-
Application Components > Advanced Available-to-Promise (aATP) > Supply
Assignment (ARun) > Cross-Applications > > Purchase Order Handling</>.
For application types (stock transport orders), you can set the
Customizing under <LS>Cross-Application Components > Advanced
Available-to-Promise (aATP) > Supply Assignment (ARun) >
Cross-Applications > Stock Transport Order Handling</>.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ARUN_MAIN004 - Item &1 is assigned; &2 cannot be changed (see long text &3) ?

  The SAP error message ARUN_MAIN004 indicates that an item (identified by &1) is currently assigned to a specific context or object, and therefore, another related item (identified by &2) cannot be changed. This error typically arises in scenarios where there are dependencies or relationships between items in the system, such as in the context of asset management, project management, or other modules where items are interrelated.
  Cause:
  
  Item Assignment: The item you are trying to change is currently assigned to another object or context, which prevents modifications.
  Dependencies: There may be dependencies or constraints in the system that require certain items to remain unchanged while others are assigned.
  Data Integrity: SAP enforces data integrity rules to ensure that changes do not lead to inconsistencies in the database.
  
  Solution:
  
  Check Assignments: Review the assignments of the item &1 to understand where it is currently being used. You can do this by navigating to the relevant transaction or using reports that show item assignments.
  Unassign or Change Context: If possible, unassign the item from its current context or change the context in which you are trying to make the modification.
  Consult Long Text: The error message references a long text (&3) that may provide additional context or specific instructions on how to resolve the issue. Make sure to check this long text for more detailed guidance.
  Review Dependencies: If there are dependencies, you may need to resolve them before making changes. This could involve changing the status of related items or completing certain processes.
  User Authorization: Ensure that you have the necessary authorizations to make changes to the items in question. Sometimes, restrictions can be due to user roles and permissions.
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may need to use specific transaction codes to view item assignments or dependencies (e.g., AS01 for asset creation, CJ20N for project management).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Documentation: Refer to SAP documentation for the specific module you are working with to understand the rules governing item assignments and changes.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who can provide more tailored assistance based on your specific system configuration and business processes.