The U.S. Court of Appeals for the Federal Circuit may have just tied the hands of RPX Corp. and Unified Patents when it comes to filing administrative patent validity challenges on behalf of their members.

In an opinion filed last week but not yet posted to the court’s website, a Federal Circuit panel ordered the Patent Trial and Appeal Board to reconsider whether Salesforce.com Inc. is a real party in interest in three inter partes reviews RPX filed in 2015. The IPRs resulted in the invalidation of two patents that are being asserted against Salesforce in Nevada federal court.