We are using Mendix version 9.12.1. We have created a published webservice that intends to receive messages from an external system with attachments. Integration wants to send this attachment as MTOM. In the Request-element, we have incorporated the folowing XML-code: <Request> <Bericht> <Data> <xop:Include href="cid:machtiging.zip" xmlns:xop="http://www.w3.org/2004/08/xop/include"/> </Data> </Bericht> </Request> When testing this with SOAP UI, we enter into an error message "Exception occurred while processing webservice request”. However, the XML-message does work with Basecode64-compression (with the attribute Data in Bericht as an unlimited string). Therefore we would like to know if anyany knows if Mendix supports MTOM for a published web service and how to configure this.