How To Fix AD420 - No change to the key field number

AD420 - Overview

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 420

• Message text: No change to the key field number

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message AD420 - No change to the key field number ?

  The SAP error message AD420 ("No change to the key field number") typically occurs in the context of data management or when working with certain SAP transactions that involve key fields, such as when trying to modify or update records in a database table.
  
  Cause:
  The error message AD420 indicates that an attempt was made to change a key field in a way that is not allowed. Key fields are critical in database tables as they uniquely identify records. If you try to change a key field to a value that does not conform to the existing structure or if the system detects that no actual change has been made to the key field, this error will be triggered.
  Common Scenarios:
  
  Attempting to change a key field to the same value: If you are trying to update a key field but the new value is the same as the existing value, the system will