How To Fix FDT_EXPRESSIONS324 - Table &1: Complex table structure not supported for mail recipients

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 324

• Message text: Table &1: Complex table structure not supported for mail recipients

What causes this issue?

For the current email action, you have defined that the mail recipients
shall be read from table &v1&. However, the line type of this table is
based on a structure data object which refers to a second structure with
more than one field. This is not permitted.

System Response

The email action cannot be activated.

How to fix this error?

Replace table &v1& by a table where the line type contains only one
textfield from which the email addresses are read by the system. As an
alternative, you can also use a table where the line type is defined by
a structure data object as long as this structure contains no more than
one text field.

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 FDT_EXPRESSIONS324 - Table &1: Complex table structure not supported for mail recipients ?

  The SAP error message FDT_EXPRESSIONS324 indicates that there is an issue with the structure of a table being used in a context where it is not supported, specifically for mail recipients. This error typically arises when trying to send emails or notifications that involve complex table structures, which the system cannot process.
  Cause:
  The error is caused by the use of a complex table structure that is not compatible with the requirements for mail recipients in SAP. This can happen if:
  
  The table contains nested structures or complex data types that cannot be serialized or formatted correctly for email.
  The data being processed is too complex for the email functionality to handle.
  
  Solution:
  To resolve this error, you can consider the following approaches:
  
  
  Simplify the Table Structure:
  
  Review the table structure being used and simplify it if possible. Avoid using nested tables or complex data types that may not be supported.
  
  
  
  Use Flat Structures:
  
  If you need to send data via email, try to use a flat structure instead of a complex one. This means ensuring that the data is in a simple, one-dimensional format.
  
  
  
  Check Data Types:
  
  Ensure that the data types used in the table are compatible with the email functionality. Stick to basic data types like strings, integers, etc.
  
  
  
  Modify the Email Logic:
  
  If you have control over the logic that generates the email, consider modifying it to handle the data differently, such as aggregating or summarizing the data before sending it.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific version you are using. There may be specific guidelines or limitations regarding the use of complex structures in email contexts.
  
  
  
  Debugging:
  
  If you have access to the development environment, you can debug the process to identify exactly where the error is occurring and adjust the logic accordingly.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional context.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered and resolved similar issues.
  Documentation: Review the official SAP documentation for the specific module or functionality you are working with, as it may provide insights into limitations and best practices.
  
  By following these steps, you should be able to address the FDT_EXPRESSIONS324 error and successfully send emails without encountering issues related to complex table structures.