How To Fix FDT_DSM023 - Custom expression types (&1) are not allowed in remote services

FDT_DSM023 - Overview

• Message type: E = Error

• Message class: FDT_DSM - BRFplus: Decision Service Manager

• Message number: 023

• Message text: Custom expression types (&1) are not allowed in remote services

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_DSM023 - Custom expression types (&1) are not allowed in remote services ?

  The SAP error message FDT_DSM023 indicates that there is an issue with the use of custom expression types in remote services within the SAP system. This error typically arises when you are trying to use a custom expression type in a context where it is not supported, particularly in remote service calls.
  
  Cause:
  The primary cause of this error is the attempt to use custom expressions or custom data types in a remote service context. SAP's remote services have certain restrictions, and custom expressions are not allowed due to serialization and compatibility issues. This is often encountered in scenarios involving:
  
  Data extraction or transformation processes.
  Remote Function Calls (RFC) or OData services that are trying to utilize custom logic or expressions.
  
  
  Solution:
  To resolve the FDT_DSM023 error, consider the following steps:
  
  
  Review Custom Expressions: Check the custom expressions you are using in your service. If they are not essential, consider removing or replacing them with standard expressions