object OrderTitle {
  @JvmOverloads
    fun generateMessage(context: Activity, otherParameter: AType? = null): AnotherType {
        // Do some things
   }
}

message = OrderTitle.generateMessage(activity, property);

error: non-static method generateMessage(Activity,Property) cannot be referenced from a static context

object OrderTitle {
    @JvmStatic
    fun generateMessage(context: Activity, otherParameter: AType? = null): AnotherType {
        // Do some things
   }
}

@file:JvmName("ClassNameHere")
fun generateMessage(context: Activity, otherParameter: AType? = null): AnotherType {
    // Do some things

ClassNameHere.generateMessage()