How To Fix AD418 - Key field number was applied; save the data

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 418

• Message text: Key field number was applied; save the data

What causes this issue?

The selected number of key fields was taken over.

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?

Now save all the attributes either explicitly or on exiting
from maintenance.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD418 - Key field number was applied; save the data ?

  The SAP error message AD418 ("Key field number was applied; save the data") typically occurs in the context of data entry or modification in SAP, particularly when dealing with key fields in a database table. This error indicates that a key field has been modified or is in a state that requires the data to be saved before proceeding with further actions.
  Cause:
  
  Modification of Key Fields: The error usually arises when a user attempts to change a key field (like a primary key) in a transaction without saving the changes first.
  Incomplete Data Entry: If the system detects that key fields have been altered but not saved, it prompts this error to ensure data integrity.
  Session Management: Sometimes, if multiple sessions are open, changes in one session may not be reflected in another, leading to this error.
  
  Solution:
  
  Save Changes: The immediate solution is to save the changes you have made to the key fields. Look for a "Save" button or use the keyboard shortcut (usually Ctrl + S) to save your data.
  Check for Required Fields: Ensure that all required fields are filled out correctly before saving. Missing mandatory fields can also trigger this error.
  Review Key Field Changes: If you are intentionally changing key fields, ensure that the changes are valid and that you understand the implications of modifying key fields in the database.
  Refresh the Session: If you suspect that the error is due to session issues, try refreshing the session or logging out and back in to see if the error persists.
  Consult Documentation: If the error continues, refer to SAP documentation or consult with your SAP administrator for specific guidance related to your system configuration.
  
  Related Information:
  
  Key Fields: In SAP, key fields are critical for identifying records uniquely in a database table. Changes to these fields can affect data integrity and relationships between tables.
  Data Integrity: SAP enforces strict data integrity rules, especially concerning key fields, to prevent issues like duplicate records or orphaned data.
  Transaction Codes: Familiarize yourself with the transaction codes relevant to the module you are working in, as they may have specific behaviors regarding key fields.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to your SAP support team or consult SAP Notes for any known issues related to this error message.