I'm trying to dtm whether a district court has the authority to make an "Affirmative Finding of Family Violence" where the charging instrument does not specify that the defendant and complainant have either a family/dating relationship.

I recently took a plea on an Agg Asslt-SBI case, and the court declined to make the finding per the plea bargain - because the charging instrument was void as to the relationship. I argued 1) that case law permits the state to prove the relationship via extrinsic evidence; and 2) the stipulations indicated that the parties were married. Obviously I won't omit the necessary language in the future, but I'd love to find a definitive answer to the question. If anyone can direct me to an appropriate source I'd appreciate it.