How To Fix LTR2_ES_CHECK234 - Number of key fields for table '&1' exceeds the maximum of 16

SAP Error Message - Details

• Message type: E = Error

• Message class: LTR2_ES_CHECK - LTR2 Checks on Embedded Specification

• Message number: 234

• Message text: Number of key fields for table '&1' exceeds the maximum of 16

What causes this issue?

Due to DDIC restrictions for tables with more than 16 key fields it is
not possible to create the preselection table for table &V1&.

System Response

This results in an error during the check.

How to fix this error?

Set the preselection setting to no preselection table. It may be
necessary to switch the selection either complete instance or complete
table.
Implement a suitible transformation rule (skip rule for MWB) that
throws the excception CX_CNV_OM_MWB_SKIP_RECORD or call the method
CNV_OM_MWB_RT=>SKIP_ SKIP_RECORD when a record should not be selected.
Assign the rule to the table.

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 LTR2_ES_CHECK234 - Number of key fields for table '&1' exceeds the maximum of 16 ?

  The SAP error message LTR2_ES_CHECK234 indicates that the number of key fields defined for a particular table exceeds the maximum limit of 16 key fields. This is a constraint in the SAP database design, where a table can have a maximum of 16 key fields (primary key fields).
  Cause:
  The error occurs when you attempt to create or modify a database table in such a way that the number of key fields exceeds the allowed limit of 16. This can happen during the creation of a new table, modification of an existing table, or when defining a composite key that includes more than 16 fields.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Key Fields: Check the definition of the table and identify the key fields that have been defined. You can do this in the Data Dictionary (SE11) by looking at the table structure.
  
  
  Reduce Key Fields: If you find that there are more than 16 key fields, you will need to reduce the number of key fields. Consider the following strategies:
  
  Combine Fields: If possible, combine some fields into a single key field. For example, if you have multiple fields that can be concatenated into a single identifier, do so.
  Reassess Key Necessity: Evaluate whether all the key fields are necessary. Sometimes, certain fields may not need to be part of the key. Remove any fields that are not essential for uniquely identifying records.
  Use Secondary Indexes: If you need to maintain the ability to search or sort by certain fields, consider creating secondary indexes instead of including them in the primary key.
  
  
  
  Adjust Table Design: If the table design is complex and requires more than 16 key fields, you may need to rethink the overall design of your data model. This could involve normalizing the data or splitting the table into multiple related tables.
  
  
  Testing: After making changes, ensure to test the table to confirm that it behaves as expected and that the changes do not negatively impact the application logic.
  
  
  Related Information:
  
  SAP Documentation: Refer to the SAP Help Portal or the Data Dictionary documentation for more information on table design and key field limitations.
  Performance Considerations: Keep in mind that having too many key fields can also impact performance. A well-designed key should balance uniqueness with performance considerations.
  Consulting with Experts: If you are unsure about how to proceed, consider consulting with an SAP Basis or ABAP expert who can provide guidance based on best practices.
  
  By following these steps, you should be able to resolve the error and ensure that your table design adheres to SAP's constraints.