ISO2002MF 

Conventions for Function-prototype-names

Function-prototype-names referenced within a source element must be either the name of the containing function definition or declared in the Repository paragraph of that or a containing source element.

If a function prototype is specified in a Repository paragraph and the function prototype declaring the same function-prototype-name is also specified within the same compilation group, the function prototype specification is used and the information in the external repository for this prototype is ignored.