Jerry,
I think the silence answers your question. I am not sure of the answer myself, but the user lexicon is a new feature while the report generator is a feature that carries over from previous versions of BW. Apparently the new feature has yet to be incorporated into the old. Your question/suggestion is a good one, and hopefully the report generator will be tweaked to allow User Lex content.
καὶ ὑπὲρ πάντων ἀπέθανεν ἵνα οἱ ζῶντες μηκέτι ἑαυτοῖς ζῶσιν, ἀλλὰ τῷ ὑπὲρ αὐτῶν ἀποθανόντι καὶ ἐγερθέντι.