How To Fix DC1303 - You have selected too many fields as key fields

SAP Error Message - Details

• Message type: E = Error

• Message class: DC1 - BDT-DC Messages

• Message number: 303

• Message text: You have selected too many fields as key fields

What causes this issue?

You have marked too many fields as key fields. The system only allows
one key field or none.

System Response

The wizard is waiting for you to correct this.

How to fix this error?

Reduce the number of fields marked as key fields to a maximum of one.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DC1303 - You have selected too many fields as key fields ?

  The SAP error message DC1303, which states "You have selected too many fields as key fields," typically occurs when you are trying to define a database table or a data structure in SAP and you have selected more key fields than the system allows.
  Cause:
  
  Exceeding Key Field Limit: In SAP, there is a limit to the number of key fields that can be defined for a table or structure. This limit is usually set to 16 key fields for database tables. If you attempt to select more than this limit, you will encounter the DC1303 error.
  Incorrect Table Design: The design of the table or structure may not be optimal, leading to an excessive number of key fields being selected.
  
  Solution:
  
  Review Key Fields: Go back to the table or structure definition and review the fields you have selected as key fields. Determine if all of them are necessary for uniquely identifying a record.
  Reduce Key Fields: Remove any fields that are not essential for the uniqueness of the records. Aim to keep the number of key fields to a minimum while still ensuring that each record can be uniquely identified.
  Use Composite Keys: If you need to maintain uniqueness across multiple fields, consider using a composite key that combines fewer fields to achieve the same uniqueness.
  Consult Documentation: Refer to SAP documentation or guidelines on best practices for defining key fields in database tables.
  
  Related Information:
  
  Key Fields in SAP: Key fields are used to uniquely identify records in a database table. They are crucial for data integrity and efficient data retrieval.
  Table Design Best Practices: When designing tables, it is important to follow best practices to ensure optimal performance and maintainability. This includes limiting the number of key fields and ensuring that the keys are meaningful.
  Transaction Codes: You may encounter this error while using transaction codes like SE11 (Data Dictionary), SE14 (Database Utility), or SE80 (Object Navigator) when creating or modifying database objects.
  
  If you continue to face issues after following these steps, consider reaching out to your SAP Basis or ABAP team for further assistance.