How To Fix AD649 - No. of key fields > &. Conversion to type & not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 649

• Message text: No. of key fields > &. Conversion to type & not allowed

What causes this issue?

The table type cannot be changed because the number of key fields for
this type is too large.
For example, a transparent table contains at most 16 key fields. A
table with more than 16 key fields therefore 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 AD649 - No. of key fields > &. Conversion to type & not allowed ?

  The SAP error message AD649 indicates that there is an issue with the number of key fields in a data structure or table exceeding the allowed limit for a specific operation. This error typically arises when you are trying to convert or manipulate data types that have a defined maximum number of key fields, and the operation you are attempting exceeds that limit.
  Cause:
  
  Exceeding Key Field Limit: The error occurs when the number of key fields in a data structure exceeds the maximum allowed number for the operation you are trying to perform. In SAP, certain data types and structures have limitations on how many key fields they can contain.
  Data Type Conversion: The error can also arise during data type conversion when the source structure has more key fields than the target structure can accommodate.
  
  Solution:
  
  Review Data Structures: Check the data structures involved in the operation. Ensure that the number of key fields does not exceed the allowed limit. You may need to reduce the number of key fields in the source structure or modify the target structure to accommodate the required key fields.
  Modify the Program Logic: If the logic of your program is causing the error, consider revising it to handle fewer key fields or to process the data in smaller batches.
  Use Alternative Data Types: If possible, consider using different data types or structures that can handle more key fields, if your application logic allows for it.
  Consult Documentation: Refer to SAP documentation or the data dictionary (SE11) to understand the limitations of the specific data types you are working with.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. Sometimes, specific versions of SAP may have bugs that are addressed in later updates.
  Data Dictionary (SE11): Use transaction SE11 to explore the data structures and their definitions, which can help you understand the key field limitations.
  Debugging: If you have access to debugging tools, you can set breakpoints and analyze the data being processed at runtime to identify where the key field count exceeds the limit.
  
  If the problem persists after trying the above solutions, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.