How To Fix TR156 - Key contains field with a special data type

TR156 - Overview

• Message type: E = Error

• Message class: TR - Change and Transport System

• Message number: 156

• Message text: Key contains field with a special data type

What causes this issue?

The key of the selected table contains one or more fields which do not
have the data type character or numeric.

System Response

An entry cannot be made in these special fields.

How to fix this error?

Enter a generic key.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TR156 - Key contains field with a special data type ?

  The SAP error message TR156, which states "Key contains field with a special data type," typically occurs when you are trying to create or modify a table or a data structure in SAP that includes a key field with a data type that is not supported for key fields. This can happen in various contexts, such as when defining database tables, structures, or views in the Data Dictionary (SE11).
  
  Cause:
  The error is usually caused by one of the following reasons:
  
  Unsupported Data Types: The key field is defined with a data type that cannot be used as a key. For example, certain complex data types or reference types may not be allowed.
  Field Length Issues: The length of the key field may exceed the maximum allowed length for key fields.
  Non-primitive Data Types: Using non-primitive data types (like structures or tables) as key fields is not permitted.
  
  
  Solution:
  To resolve the TR156 error, you can take