How To Fix E7042 - Assignment of an internal key is not permissible

SAP Error Message - Details

• Message type: E = Error

• Message class: E7 - IS-U master data

• Message number: 042

• Message text: Assignment of an internal key is not permissible

What causes this issue?

You have attemted to create a connection object or a device location
without assigning an external key, although this is not permitted.

System Response

The transaction was terminated.

How to fix this error?

Specify a key during creation of a connection object or device
location.

Procedure for System Administrators

Table <DS:SIMG._ISUBD_000002>TE130</> may not be correctly maintained.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E7042 - Assignment of an internal key is not permissible ?

  The SAP error message E7042, "Assignment of an internal key is not permissible," typically occurs when there is an attempt to assign a value to a variable that is defined as an internal key in the context of ABAP programming. This error is often related to the use of internal tables, structures, or fields that are not allowed to be assigned directly.
  Cause:
  
  Internal Key Assignment: The error usually arises when you try to assign a value to a field that is defined as an internal key (e.g., a primary key in a database table or a unique identifier in an internal table).
  Data Type Mismatch: There may be a mismatch in data types between the source and target fields.
  Incorrect Use of Internal Tables: If you are trying to manipulate internal tables incorrectly, such as trying to assign a key field directly instead of using the appropriate methods.
  
  Solution:
  
  Check Data Types: Ensure that the data types of the source and target fields match. If they do not, you may need to convert the data type before assignment.
  Use Proper Assignment Methods: Instead of directly assigning values to internal key fields, use appropriate methods such as APPEND, INSERT, or MODIFY for internal tables.
  Review the Code: Look for the specific line of code that triggers the error and analyze the context. Ensure that you are not trying to assign a value to a key field directly.
  Debugging: Use the ABAP debugger to step through the code and identify where the assignment is happening. This can help you understand the flow and the data being processed.
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for more details on internal tables and key fields.
  SAP Community: Check the SAP Community forums for similar issues and solutions shared by other developers.
  SAP Notes: Search for relevant SAP Notes that might address specific scenarios related to this error message.
  
  By following these steps, you should be able to identify the cause of the E7042 error and implement a suitable solution.