How To Fix KN419 - Entry for table field & already exists

KN419 - Overview

• Message type: E = Error

• Message class: KN - Reporting for Costing

• Message number: 419

• Message text: Entry for table field & already exists

What causes this issue?

You are attempting to select a data field that you want to use in the
results list of order selection as a display field. However, this field
has already been selected.

How to fix this error?

Delete your entry, or enter a different data field (one that you have
not yet selected). For a list of available data fields, use the
Possible Entries function (F4).

Error message extract from SAP system. Copyright SAP SE.

KN419 - Details

• The SAP error message KN419 ("Entry for table field & already exists") typically occurs when you are trying to create or update a record in a table where a unique constraint is violated. This means that the entry you are attempting to add already exists in the database, and the system is preventing the duplication of that entry.
  
  Cause:
  
  Duplicate Entry: The most common cause is that you are trying to create a customer master record (or another related record) with a key that already exists in the database.
  Incorrect Data Entry: There may be a mistake in the data you are entering, such as using an existing customer number or other unique identifier.
  Data Migration Issues: If you are migrating data from another system or performing a mass upload, there may be duplicates in the data being imported.
  
  
  Solution:
  
  Check Existing Records: Before creating a new record, check the existing records in the relevant table