mla-
The purpose of the lawsuit would be to induce them to sign the document, not to squeeze money out of them. While I work in litigation and these types of situations pay for my mortgage, I don't believe in just suing someone for money.
I have to respectfully disagree with you about it being difficult to find an attorney. There are entirely too many lawyers in the US, finding one would be no problem. I could find a lawyer, albeit an unemployed one, to wash my car.
I also have to respectfully disagree that you wouldn't have standing to sue. It's a scarily low hurdle to clear to have standing in court. As far as having standing, I could think of a couple of grounds of the top of my head:
1) One could argue that the CPA's actions (or inaction in this example) has led to lost wages or diminished earning capacity due to the employer not signing. This avenue would sue for monetary damages, with the ultimate goal to be to push to settle for a signature.
2) The CPA breached the terms of the employment contract, or through tortious interference with the employment contract. e.g. Employee is expected to get CPA (either express or implied), and otherwise fulfills the terms of their employment by being a good employee and playing by the rules (generally spelled out in the employee handbook or an actual employment contract); however, is denied the experience reference. This avenue would compel specific performance, in this case a signature.
While I agree that it's the CPA's license, I completely disagree that he or she can just not sign it because its “their license”. It's the state board's responsibility to determine who may be a CPA, not a supervisor. The CPA isn't attesting to their intelligence, or the quality of their work, but merely that they did the qualifying work. The 150 credit rule aside, I think we can all agree that the tests do a pretty good job a screening out anyone that doesn't posses the shall we say, mental facilities or the dedication to the profession.
Also, I should clarify that I'm not proposing that if one is in this situation, that they should just fly off the handle and sue the CPA. I'm merely saying that it is an option that should be explored if all other avenues prove unsatisfactory.