App Callback, toXML(Dictionary) function does not contain repeating groups

When getting a message from fromApp() Callback, it seems, that the message does not contain the repeating groups. I´m using the toXML(Dictionary) function and have added some debug statements to the core library. The message.toString() function does not show up the repeating groups as well. If i read the message back from MessageStore, then the message.toXML(Dictionary) does list the repeating groups. To get the full message i have to reread the message from MessageStore (in my case a FileStorage).