You should involve your lawyer in this process, as you may need to consider additional thought so that the amendment can be applied. This is especially true if the current supplier knows that you need five months to negotiate a new agreement with another supplier. It is important to understand who is a business partner and who is not, as only BAAs need to be changed. A counterparty is an entity that provides or supports on your behalf: (1) one of the following when it comes to the use or disclosure of PHI: (see flowchart to designate a counterparty). In some cases, Yale may act as counterparty to another covered company. .