How To Fix FDT_EXPRESSIONS142 - Line &1 is equivalent to line &2 (unreachable in first match mode)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 142

• Message text: Line &1 is equivalent to line &2 (unreachable in first match mode)

What causes this issue?

Translators, take care: Parameters V1 and V2 have been exchanged, this
is important to keep the message content logically correct! 20. 08. 2010
In the current decision table, the conditions you have entered in lines
&V2& and &V1& are equivalent. However, because the decision table has
been defined to operate in first match mode, condition &V1& will never
be checked. This is due to the fact that the decision table conditions
are always processed from top to bottom, and in first match mode,
operation stops at the first condition that is satisfied.

System Response

The decision table cannot be activated.

How to fix this error?

Analyze the two conditions in question. Depending on the result, choose
one of the following solutions:
Conditions are duplicates and have been entered by mistake: Remove the
duplicate. This can of course also mean that you change one of the
conditions so that they are no longer equivalent.
Conditions are duplicates but have been entered by intention: If, for
whatever reason, you want to associate the same input conditions with
two or more different results, you can accomplish this by switching the
decision table into multiple match mode. This will make the system
collect all matching results, regardless of whether the input conditions
are overlapping or not.

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_EXPRESSIONS142 - Line &1 is equivalent to line &2 (unreachable in first match mode) ?

  The SAP error message FDT_EXPRESSIONS142 indicates that there is a problem with the expression definitions in your SAP system, specifically in the context of the Field Data Tool (FDT). The message states that "Line &1 is equivalent to line &2 (unreachable in first match mode)," which means that two lines of code or expressions are effectively the same, and as a result, one of them is unreachable when the system is trying to evaluate the expressions in first match mode.
  Cause:
  
  
  Duplicate Expressions: The error typically arises when there are two expressions that evaluate to the same result or condition. In first match mode, the system processes expressions sequentially and stops at the first match it finds. If two expressions are identical, the second one becomes unreachable.
  
  
  Logical Errors: There may be a logical error in the way expressions are defined, leading to redundancy.
  
  
  Configuration Issues: Sometimes, this can be due to incorrect configuration or setup in the FDT where expressions are defined.
  
  
  Solution:
  
  
  Review Expressions: Check the expressions defined in the relevant FDT configuration. Look for lines that are equivalent or redundant. You may need to modify or remove one of the expressions to resolve the conflict.
  
  
  Refactor Code: If you find that two expressions are indeed performing the same function, refactor your code to eliminate redundancy. Keep only the necessary expression.
  
  
  Test Changes: After making changes, test the configuration to ensure that the error is resolved and that the intended functionality is preserved.
  
  
  Consult Documentation: If you are unsure about the expressions or how to modify them, refer to the SAP documentation or help resources related to the Field Data Tool.
  
  
  Seek Help from SAP Support: If the issue persists or if you are unable to identify the cause, consider reaching out to SAP support for assistance.
  
  
  Related Information:
  
  Field Data Tool (FDT): This is a tool used in SAP for managing field-level data processing and transformations. Understanding how it works can help in troubleshooting issues related to expressions.
  First Match Mode: This is a processing mode where the system evaluates expressions in the order they are defined and stops at the first one that matches the criteria. Understanding this concept is crucial for effective expression management.
  SAP Notes and Community: Check SAP Notes for any known issues or patches related to FDT and the specific error message. The SAP Community forums can also be a valuable resource for finding solutions shared by other users.
  
  By following these steps, you should be able to resolve the FDT_EXPRESSIONS142 error and ensure that your expressions are functioning correctly.