In any proceeding held pursuant to this chapter, a party may not present evidence of any previous sexual conduct of a child to challenge the child’s credibility as a witness unless the attorney for the child has first presented evidence or the child has testified concerning such conduct, or the absence of such conduct, on direct examination by the district attorney or the attorney for the child, in which case the scope of the cross-examination of the child or rebuttal must be limited to the evidence presented by the child’s attorney or the child.