How To Fix FDT_CORE159 - Expression types need to be assigned to system applications

FDT_CORE159 - Overview

• Message type: E = Error

• Message class: FDT_CORE - Formula & Derivation Tool: Core

• Message number: 159

• Message text: Expression types need to be assigned to system applications

What causes this issue?

You have tried to create a custom expression type. In addition, the
system has determined that the current application has been defined for
storage type <ZH>Customizing</> or <ZH>Master Data</>. However, custom
expression types can only be created for applications with storage type
<zh>System</>.

System Response

The object cannot be created.

How to fix this error?

To create custom expression types, make sure the application where you
want to create the expression type has storage type <zh>System</>
assigned.

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.

FDT_CORE159 - Details

• The SAP error message FDT_CORE159 typically indicates that there is an issue with the expression types in the context of SAP's Flexible Data Import (FDI) or Flexible Data Transfer (FDT) framework. This error suggests that the expression types used in your configuration or data mapping are not properly assigned or recognized by the system applications.
  
  Cause:
  
  Incorrect Configuration: The expression types may not be correctly configured in the FDT framework.
  Missing Assignments: The expression types might not be assigned to the relevant system applications, leading to this error.
  Version Compatibility: There could be compatibility issues with the version of the FDT framework you are using.
  Data Model Issues: The data model may not be correctly defined, leading to mismatches in expected expression types.
  
  
  Solution:
  
  Check Expression Types: Review the expression types defined in your FDT configuration. Ensure that they are correctly set up and assigned to the appropriate system applications.
  Assign Expression Types: If the expression types are