How To Fix C1157 - Check table & has too many key fields

SAP Error Message - Details

• Message type: E = Error

• Message class: C1 - Characteristics maintenance messages

• Message number: 157

• Message text: Check table & has too many key fields

What causes this issue?

You have entered a check table that has more than one key field,
possibly because an existing client is not taken into account.
Check tables with more than one key field are not supported. However,
if you enter a function module for checking values, you can refer to
any check table in your own coding.

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?

Please choose a check table that contains exactly one key field and a
client, if required.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message C1157 - Check table & has too many key fields ?

  The SAP error message C1157, which states "Check table & has too many key fields," typically occurs when you are trying to create or modify a check table in the Data Dictionary (SE11) and the number of key fields exceeds the allowed limit. In SAP, a check table is a table that is used to validate entries in a field of a primary table, and it is linked to a foreign key relationship.
  Cause:
  The error is caused by the check table having more key fields than the maximum allowed by the SAP system. The maximum number of key fields for a check table is generally limited to 16. If you attempt to define a check table with more than this limit, you will encounter this error.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Key Fields: Check the number of key fields defined in the check table. If it exceeds 16, you will need to reduce the number of key fields.
  
  
  Reassess Table Design: Consider whether all the key fields are necessary. You may need to redesign the table structure or the relationships between tables to ensure that the check table can function correctly with fewer key fields.
  
  
  Use Composite Keys: If applicable, consider using composite keys or alternative design patterns that can help reduce the number of key fields in the check table.
  
  
  Split the Check Table: If the check table is too complex, you might consider splitting it into multiple check tables, each with a manageable number of key fields.
  
  
  Consult Documentation: Refer to SAP documentation or consult with your SAP Basis or ABAP team for best practices regarding table design and foreign key relationships.
  
  
  Related Information:
  
  Transaction Codes: You can use transaction codes SE11 (Data Dictionary) to view and modify the check table.
  Foreign Key Relationships: Understanding how foreign key relationships work in SAP can help you design your tables more effectively.
  SAP Notes: Check for any relevant SAP Notes that might provide additional guidance or updates related to this error.
  
  By following these steps, you should be able to resolve the C1157 error and successfully create or modify your check table in SAP.