How To Fix FDT_EXPRESSIONS844 - Mapping parameter position &1: &2 is a unknown type

FDT_EXPRESSIONS844 - Overview

• Message type: E = Error

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

• Message number: 844

• Message text: Mapping parameter position &1: &2 is a unknown type

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.

FDT_EXPRESSIONS844 - Details

• The SAP error message FDT_EXPRESSIONS844 indicates that there is an issue with a mapping parameter in your SAP Data Services or SAP Fiori application. Specifically, it suggests that the mapping parameter at a certain position is of an unknown type, which means that the system cannot recognize or process the data type being used.
  
  Cause:
  
  Incorrect Data Type: The mapping parameter may be defined with a data type that is not recognized by the system. This could happen if the data type is custom or if there is a mismatch between the expected and actual data types.
  Missing or Incorrect Mapping: The mapping configuration may be incomplete or incorrectly set up, leading to the system being unable to identify the type of the parameter.
  Version Compatibility: If you are using a newer or older version of SAP Data Services or Fiori, there may be compatibility issues with certain data types.
  Corrupted Metadata: Sometimes, metadata can