How To Fix MC590 - Target field may only be assigned once

SAP Error Message - Details

• Message type: E = Error

• Message class: MC - Aggregate: views, matchcodes, lock objects

• Message number: 590

• Message text: Target field may only be assigned once

What causes this issue?

You have defined more than one target field. In order to be able to use
matchcodes as an online utility, you must set up a connection between a
matchcode field and a screen field. This connection is defined with
the target field. In a matchcode selection, the value of this field is
transferred to the screen field.

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?

Mark only one field as target field.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC590 - Target field may only be assigned once ?

  The SAP error message MC590 ("Target field may only be assigned once") typically occurs in the context of data processing or data transfer within SAP, particularly when working with data extraction or reporting in the Material Management (MM) module or similar areas. This error indicates that there is an attempt to assign a value to a target field more than once, which is not allowed.
  
  Cause:
  
  Duplicate Assignments: The most common cause of this error is that the same target field is being assigned multiple times within a single processing block or logic. This can happen in ABAP programs, data transfer routines, or during the execution of certain transactions.
  Incorrect Logic: The logic in the program or configuration may inadvertently lead to multiple assignments to the same field.
  Data Source Issues: If the data source is providing duplicate records or if there are issues with the data extraction logic, it may lead to this