Release 10.1A: OpenEdge Getting Started:
Object-oriented Programming

Data type mapping

When calling a method, the compiler checks that the data types of the parameters are consistent with the method definition. The data type of the caller must match exactly with the data type of the called method. This strong data type matching is exactly the same as when you invoke a user-defined function. The compiler does not employ the implicit conversion rules used by the RUN statement to call procedures.