How To Fix NP186 - Key to table & is too long

SAP Error Message - Details

• Message type: E = Error

• Message class: NP - New checks in the activating program

• Message number: 186

• Message text: Key to table & is too long

What causes this issue?

The sum of the field length of all key fields of the table exceeds the
allowed value.

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?

Either remove fields from the key or reduce the length of the key
fields.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message NP186 - Key to table & is too long ?

  The SAP error message NP186, which states "Key to table & is too long," typically occurs when you are trying to create or manipulate a key in a database table that exceeds the maximum length allowed for that key. This can happen in various scenarios, such as when defining a primary key, foreign key, or when using certain database operations that involve keys.
  Cause:
  
  Key Length Exceeded: The primary cause of this error is that the key you are trying to use exceeds the maximum length defined for that particular table in the database. Each database table has a limit on the length of its key fields, and if you attempt to use a key that is longer than this limit, the error will be triggered.
  Data Type Mismatch: If the data type of the key field is not compatible with the data being inserted or updated, it can also lead to this error.
  Concatenated Keys: If you are using a concatenated key (a key made up of multiple fields), the combined length of these fields may exceed the maximum allowed length.
  
  Solution:
  
  Check Key Length: Review the definition of the table in the Data Dictionary (SE11) to determine the maximum key length allowed. Ensure that the key you are trying to use does not exceed this length.
  Modify Key Structure: If possible, consider modifying the structure of the key. This could involve:
  
  Reducing the length of the fields that make up the key.
  Changing the data type of the key fields to a more appropriate type that allows for shorter representations.
  
  
  Use Alternative Keys: If the key is too long due to concatenation, consider using a different approach to create a unique identifier for the records, such as using a surrogate key (e.g., an auto-incrementing integer).
  Data Validation: Ensure that the data being inserted or updated adheres to the constraints of the table. Implement validation checks in your application logic to prevent long keys from being processed.
  Database Configuration: If you have control over the database schema, you may consider altering the table definition to allow for longer keys, but this should be done with caution and understanding of the implications.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like SE11 (Data Dictionary) to check the table structure and key definitions.
  SAP Notes: Check SAP Notes for any specific guidance or patches related to this error message, as there may be updates or fixes provided by SAP.
  Documentation: Refer to SAP documentation for best practices on key management and database design to avoid such issues in the future.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with your SAP Basis or ABAP team for further investigation and assistance.