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

C1157 - Overview

• 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.

C1157 - Details

• 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