BizTalk: How to set useAmbientTransaction. "Distributed transaction completed. Either enlist this session in a new transaction or the NULL transaction." 17. March 2016 ToanLam@phidiax.com BizTalk / Enterprise Service Bus, Phidiax Technology (0) Don't set useAmbientTransaction to FALSE. May cause ancillary issues. May arise from BizTalk implementation using WCF-Custom adapter to call a transactional SQL procedure. Error: Distributed transaction completed. Either enlist this session in a new transaction or the NULL transaction. [More]