Problem:

Release: 3.1   The definitive answer the question  is yes, external names are case sensitive.

Resolution:

Example:

CLASS-ID. classa AS "ClassA". *> "ClassA" is the external name

REPOSITORY.

    CLASS myclass AS "myClass" *> "myClass" is the external name.

    CLASS classB *> No AS clause "CLASSB" is the external name.    .

    CLASS classa *> external name taken from CLASS-ID clause, "ClassA"

    .