How To Fix WF_EXPR001 - An ABAP elementary type C, N, P or X was expected, not "&1"

WF_EXPR001 - Overview

• Message type: E = Error

• Message class: WF_EXPR - Expression Evaluation, Analysis and Parsing.

• Message number: 001

• Message text: An ABAP elementary type C, N, P or X was expected, not "&1"

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WF_EXPR001 - An ABAP elementary type C, N, P or X was expected, not "&1" ?

  Certainly! Here's a detailed explanation for the SAP error message WF_EXPR001:
  
  Error Message
  WF_EXPR001:
  An ABAP elementary type C, N, P or X was expected, not "&1".
  
  Cause
  This error occurs in SAP Workflow when an expression or condition expects a value of a specific ABAP elementary data type, but the actual data type provided does not match the expected types.
  Specifically, the workflow engine expects one of the following elementary types:
  
  C (Character)
  N (Numeric text)
  P (Packed number)
  X (Hexadecimal)
  
  If the expression or condition is given a data type other than these (for example, a structure, table, or a different data type like I (integer), D (date), or a complex object), the error WF_EXPR001 is raised.
  
  When does it typically occur?
  
  When defining conditions or expressions in workflow steps, such as in decision steps, container element comparisons, or binding expressions.
  When using workflow expression editor or when the workflow engine evaluates expressions.
  When the data element or variable used in the expression