How To Fix FDT_CORE157 - Assigned expression uses &1 which is not in the context

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 157

• Message text: Assigned expression uses &1 which is not in the context

What causes this issue?

For the current function, you have assigned a top expression. In the
definition of this expression, data object &v1& is used. However, &v1&
is not included in the function signature and can therefore not be
passed as a context data object to subordinate expressions.

System Response

The function cannot be activated.

How to fix this error?

Make sure that data object &v1& is part of the function signature.

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_CORE157 - Assigned expression uses &1 which is not in the context ?

  The SAP error message FDT_CORE157 indicates that there is an issue with an assigned expression in a formula or expression context where a variable or field (&1) is being referenced but is not available in the current context. This typically occurs in the context of SAP's Form Data Technology (FDT) or when working with expressions in SAP applications.
  Cause:
  
  Variable Not Defined: The variable or field you are trying to use in your expression has not been defined in the current context.
  Scope Issues: The variable may be defined in a different scope or context that is not accessible from where you are trying to use it.
  Typographical Errors: There may be a typo in the variable name, causing the system to not recognize it.
  Context Changes: The context in which the expression is evaluated may have changed, leading to the variable being unavailable.
  
  Solution:
  
  Check Variable Definition: Ensure that the variable or field you are trying to use is defined in the current context. You may need to declare it or ensure it is included in the relevant data structure.
  Review Scope: Verify that the variable is accessible in the scope where you are trying to use it. If it is defined in a different context, you may need to pass it or redefine it in the current context.
  Correct Typos: Double-check the spelling of the variable name to ensure there are no typographical errors.
  Context Evaluation: If the context has changed, review the logic of your application or script to ensure that the variable is still valid in the new context.
  Debugging: Use debugging tools to trace the execution and see where the variable is expected to be defined and where it is being referenced.
  
  Related Information:
  
  Documentation: Refer to SAP documentation on Form Data Technology (FDT) for more details on context and variable management.
  SAP Community: Check forums and community discussions for similar issues and solutions shared by other users.
  SAP Notes: Look for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  
  If the issue persists after trying the above solutions, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.