The best way to deal with a procurement violation is to avoid them in the first place. One of the most important provisions of the procurement code is the safeguarding of public money. Your most important duty as a procurement person is to ensure that every procurement you make is done according to the law.
Upon written notification of a violation, it is important to cooperate with the person investigating. They will investigate the alleged violation, then make a written determination as to the cause of the violation and what should be done in the future to keep the violation from occurring. Each person who is delegated purchasing authority must know the rules of procurement. Not knowing the rules is not a viable excuse for a procurement violation. Your division's procurement authority can be revoked.