How To Fix AD237 - Only structures can be included in database tables

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 237

• Message text: Only structures can be included in database tables

What causes this issue?

A database table may not be included either directly or indirectly in
another database table.
This means that a structure that in turn includes a database table may
not be included either.

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?

You cannot include the table (or the structure containing a table).
You can:
Directly insert the fields.
Create a copy of the included DB table as structure and include it.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD237 - Only structures can be included in database tables ?

  The SAP error message AD237 ("Only structures can be included in database tables") typically occurs when you attempt to include a data element or a field that is not a structure in a database table definition. In SAP ABAP Dictionary, database tables can only contain fields that are defined as structures or data elements that are based on structures.
  Cause:
  
  Incorrect Field Type: You may have tried to include a field that is defined as a simple data type (like a character or numeric type) instead of a structure.
  Data Element Misconfiguration: The data element you are trying to use might not be defined correctly or is not based on a structure.
  Inclusion of Non-Structure Types: Attempting to include a table or view directly in a database table definition, which is not allowed.
  
  Solution:
  
  Check Field Definitions: Ensure that all fields you are trying to include in the database table are either structures or data elements that are based on structures.
  Create or Modify Structures: If you need to include complex data types, create a structure in the ABAP Dictionary (transaction SE11) and use that structure in your database table.
  Use Data Elements Correctly: If you are using data elements, make sure they are defined correctly and are based on structures.
  Review Table Definition: Go back to the table definition and ensure that you are not trying to include any non-structure types.
  
  Related Information:
  
  Transaction SE11: This is the ABAP Dictionary transaction where you can create and manage database tables, structures, data elements, domains, etc.
  Data Elements and Domains: Understand the difference between data elements (which can be based on domains) and structures. Data elements can be used to define fields in tables, but they must be based on structures if they are to be included in a database table.
  SAP Documentation: Refer to SAP Help documentation for more details on data dictionary objects and their relationships.
  
  By following these steps, you should be able to resolve the AD237 error and successfully define your database table.