When a DEF_MTH_EX does not specify an ENTRYPOINT, it means that the external method being called is a program.
When a DEF_MAP_EX is used with such an associated DEF_MTH_EX these rules apply:
Example: Define an argument that is a date to be passed in DDMMYY format with separator of "," to a program
Def_Map_Ex Name(InvoiceDate) For(*BOTH) Type(*DATE) Format(*DMY) Date_Separator(*COMMA)