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This run-time error occurs if a function is called by macro expansion, but
has not been declared EXTERNAL. The linker cannot "see" function names
embedded in strings, so you must declare them external. Better still,
convert them to code blocks; they'll execute faster and you won't have to
declare them EXTERNAL.

The engine routinely declares EXTERNAL the dictionary default library
functions it uses. Other library functions whose names are in dictionary
Udf fields or index key fields must be declared EXTERNAL.