The RUN and CALL statements have orders of resolution that need to be considered only when you have given a module the same name as a built-in IML subroutine. In such cases, use the CALL statement to ...

A user-defined module An IML built-in function or subroutine This resolution order need only be considered if you have defined a module that has the same name as an IML built-in subroutine. If a RUN ...