How To Fix AD688 - Tab. &: No. of key fields > & (no change possible in type TRANSP)

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 688

• Message text: Tab. &: No. of key fields > & (no change possible in type TRANSP)

What causes this issue?

A transparent table may contain at most 16 key fields. A table with
more than 16 key fields cannot be converted into a transparent table.

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?

If you want to change the table type, you must first remove fields from
the key.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD688 - Tab. &: No. of key fields > & (no change possible in type TRANSP) ?

  The SAP error message AD688 indicates that there is an issue with the number of key fields defined for a database table. Specifically, the error message states that the number of key fields exceeds the allowed limit for a transparent table. In SAP, a transparent table can have a maximum of 16 key fields.
  Cause:
  The error occurs when you attempt to modify a transparent table (type TRANSP) to add more key fields than the maximum allowed (16). This can happen during the creation or modification of a table in the Data Dictionary (SE11) or when trying to activate a table that has been incorrectly defined.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Key Fields: Check the definition of the table in the Data Dictionary (SE11) and review the key fields that have been defined. Ensure that the total number of key fields does not exceed 16.
  
  
  Reduce Key Fields: If you find that there are more than 16 key fields, you will need to reduce the number of key fields. This can be done by:
  
  Removing unnecessary key fields.
  Combining fields if possible (e.g., using a composite key).
  Evaluating the design of the table to see if all key fields are necessary.
  
  
  
  Re-activate the Table: After making the necessary changes, try to activate the table again. This should resolve the error if the number of key fields is now within the allowed limit.
  
  
  Check Dependencies: If the table is already in use, ensure that any dependent objects (like views, indexes, or foreign key relationships) are also reviewed and adjusted if necessary.
  
  
  Related Information:
  
  Maximum Key Fields: The maximum number of key fields for a transparent table is 16. This is a limitation set by the SAP database architecture.
  Table Types: Understand the different types of tables in SAP (e.g., transparent, pooled, cluster) and their characteristics.
  Data Dictionary (SE11): Familiarize yourself with the Data Dictionary transaction (SE11) to manage and define database objects effectively.
  Performance Considerations: Having too many key fields can impact performance, so it's essential to design tables with an optimal number of key fields based on the use case.
  
  If you continue to experience issues after following these steps, consider consulting with a technical SAP consultant or checking SAP Notes for any specific guidance related to your version of SAP.