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-4050 Function "name" has been used and hence declared as informal

before this formal declaration.

A call to this function appears prior to this declaration of it. Calls to undeclared functions are supported only for compatibility with previous versions of the 4GL language. When the compiler encountered the call to the function, it assumed an informal declaration for it. Move the declaration of the function to the top of the source module so that it precedes calls to it.