How To Fix ARUN_MAIN003 - Item &1 is assigned; changing &2 will unassign the item partially

SAP Error Message - Details

• Message type: E = Error

• Message class: ARUN_MAIN -

• Message number: 003

• Message text: Item &1 is assigned; changing &2 will unassign the item partially

What causes this issue?

The material is relevant to Supply Assignment (ARun) and an assignment
exists for this document item.
The document item will be unassigned for one of the following reasons
and changing the document item will partially unassign the item.
o,,You have defined the Customization for the document item under
<LS>Cross-Application Components > Advanced Available-to-Promise (aATP)
> Supply Assignment (ARun) > Cross-Applications > Purchase Order
Handling</>, changing the document item will unassign the order. You
have set the field check as <ZK>W = Warnings Before an Order is
Unassigned</>.
o,,You have not defined a rule to unassign orders under
<LS>Cross-Application Components > Advanced Available-to-Promise (aATP)
> Supply Assignment (ARun) > Cross-Applications > Purchase Order
Handling</>. The item will be unassigned automatically.

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?

Define rules to unassign orders for an application type in Customizing
under <LS>Cross-Application Components > Advanced Available-to-Promise
(aATP) > Supply Assignment (ARun) > Cross-Applications</>.
By defining a rule to unassign orders, you specify exactly how the
system should react when an application type is modified (for example,
change in requirement date, goods receipt date, plant, storage location,
and so on).
You set the appropriate fields listed in the application type in
Customizing. For field checks, you can assign one of the following
options.
N = No Action
W = Warnings Before an Order is Unassigned
E = Change Not Permitted
Depending on the selected parameter, the system decides how and when the
quantities should be unassigned.

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_MAIN003 - Item &1 is assigned; changing &2 will unassign the item partially ?

  The SAP error message ARUN_MAIN003 indicates that there is an issue with the assignment of an item in a document or transaction. Specifically, it suggests that the item identified by &1 is currently assigned, and if you proceed to change &2, it will result in the item being partially unassigned. This typically occurs in scenarios involving document processing, such as in accounts receivable, inventory management, or other transactional contexts.
  Cause:
  
  Partial Assignment: The item is linked to multiple components or documents, and changing one of these components will disrupt the current assignment.
  Data Integrity: The system is designed to maintain data integrity, and any changes that could lead to inconsistencies will trigger this warning.
  Configuration Issues: There may be configuration settings in the system that dictate how items are assigned and unassigned, leading to this error when changes are attempted.
  
  Solution:
  
  Review Assignments: Check the current assignments of the item (&1) to understand how it is linked to other components. This can often be done through transaction codes related to the specific module you are working in (e.g., VA03 for sales orders, ME23N for purchase orders).
  Assess Changes: Before making changes to &2, assess whether it is necessary to proceed. If the change is essential, consider the implications of unassigning the item partially.
  Unassign Manually: If you need to change &2, you may need to manually unassign the item from its current assignment before making the change.
  Consult Documentation: Refer to SAP documentation or help files for specific guidance on handling assignments in the context you are working in.
  Contact Support: If the issue persists or if you are unsure about the implications of the changes, consider reaching out to your SAP support team or consulting with an SAP expert.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes that pertain to the module you are working in (e.g., MM, SD, FI).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Authorization: Ensure that you have the necessary authorizations to make changes to the items and their assignments.
  Testing Changes: If possible, test the changes in a development or quality assurance environment before applying them in production to avoid unintended consequences.
  
  By following these steps, you should be able to address the ARUN_MAIN003 error effectively.