Why is this an issue?

Two methods having the same implementation are suspicious. It might be that something else was intended. Or the duplication is intentional, which becomes a maintenance burden.

class Circle(var radius: Int) {
  def width_=(size: Int) {
    radius = size / 2
    updateShape()
  }

  def height_=(size: Int) { // Noncompliant: duplicates width_
    radius = size / 2
    updateShape()
  }

  def updateShape() = {...}
}

If the identical logic is intentional, the code should be refactored to avoid duplication. For example, by having both methods call the same method or by having one implementation invoke the other.

class Circle(var radius: Int) {
  def width_=(size: Int) {
    diameter = size
  }

  def height_=(size: Int) {
    diameter = size
  }

  def diameter_=(size: Int) { // Implementation is shared
    radius = size / 2
    updateShape()
  }

  def updateShape() = {...}
}

Exceptions

Methods with fewer than 2 statements are ignored.