Police Minister Judith Collins is "disappointed" in the Serious Fraud Office boss for celebrating the charges against Rod Petricevic with Bridgecorp champagne and says she does not expect the behaviour to be repeated.
Ms Collins said SFO chief executive Adam Feeley now knew why his actions were inappropriate, but she would raise the matter when she was next briefed by him.
Mr Feeley has already apologised in writing to Ms Collins after she referred the matter to the State Services Commission.
"I think it was very clear that I was disappointed with the events that led to this matter being referred to the SSC in the first place and understand Mr Feeley is now well aware of why his actions were inappropriate," Ms Collins told the Herald. "I don't expect to see a repeat of the behaviour.
"I don't think it's appropriate for a law enforcement body to put itself in a position where it might appear to have acted in an unprofessional manner, even though Mr Feeley was quite clearly trying to congratulate and celebrate the staff for their work.