My experience letter was signed by the school Principal, he no longer works at the school. I also don't work there now. The letter does not state job duties/responsibilites, I will go back and try to get a letter just specifying job roles which will most probably be signed by HR. Which means to prove work experience I will have to provide both the experience letter signed by Principal and a separate job letter signed by HR. Is that alright? I hope it won't be an issue.