oracle.oai.agent.common.AgentRuntimeException: Error: the message has more than one attribute (or more than one IN or OUT attribute for invoke or implement messages) in iStudio. Please make sure to import only one DTD for subscribe messages and only one IN and one OUT DTD for invoke and implement messages and do not add other attributes.
The message is a simple one with a id attribute and a string attribute. The logging shows that the message looks as expected when it comes to the FTP-adapter.
I seems strange that the error states that a message can ony have one attribute.
The stacktrace is as follows: