Will I be dismissed as a defendant in a small claims case filed against an employer that failed to fulfill an order for their client?

I assume, since you were taking the money on behalf of the business, you signed the receipt on its behalf, and not on your own.  For example, the receipt should have read something like "John Doe, sales clerk, ABC Company" or "ABC Co. by John Doe."  If all you did was sign that you received the money, you are indicating that you, personally, and not your boss or your boss' business, were being paid for your services. However, if the receipt does not indicate that you, personally, took money and promised to deliver the order, you should not have any liability for these claims.  You are not an owner of the business (I assume the business  was not a separate legal entity like a corporation, or else only the business entity, not either of the two of you, would be liable), and it doesn't seem like you committed any torts, like fraud, for which you could be individually liable.  However, you can't count on someone else to explain your role in this matter.  What if the customer claims that you lied to hiim/her by promising that he/she would get the order while knowing that he/she never would?  That would be a fraud, for which you could be personally liable.  You need to go to Court yourself to tell your side of the story.