Normally it get created by BTAHL7 setup, if it has not been created then you can create it and specify the URI of this receive location as ‘127.0.0.1:65535’ or it doesn't matter much you can create any other and can specify the URI of that receive location
in '
Submit Receive Location (URI) for ACK' while configuring MLLP adapter for send port and all the acknowledgements will be routed to that receive location.
Please mark the post answered your question as answer, and mark other helpful posts as helpful, it'll help other users who are visiting your thread for the similar problem, Regards -Rohit Sharma (http://rohitt-sharma.blogspot.com/)