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Why is this an issue?
A chain of If/ElseIf
statements is evaluated from top to bottom. At most, only one branch will be executed: the first statement with a condition that evaluates to
True. Therefore, duplicating a condition leads to unreachable code inside the duplicated condition block. Usually, this is due to a
copy/paste error.
The result of such duplication can lead to unreachable code or even to unexpected behavior.
How to fix it
Code examples
Noncompliant code example
If param = 1 Then
  OpenWindow()
ElseIf param = 2 Then
  CloseWindow()
ElseIf param = 1 Then ' Noncompliant: condition has already been checked
  MoveWindowToTheBackground() ' unreachable code
End If

Compliant solution
If param = 1 Then
  OpenWindow()
ElseIf param = 2 Then
  CloseWindow()
ElseIf param = 3 Then
  MoveWindowToTheBackground()
End If

Resources
Documentation

  
 If…​Then…​Else
  Statement