Quality of Services "Exactly Once in Order"

Hi,

I have several integration using iDOC output R / 3.

This integration into the Integration Builder them removed brand "Maintain Order At runtime" (Quality of Services - Interface Determination) to be executed in parallel, but when they reach the engine J2EE appear with the Quality of Services as "Exactly Once in Order."

Why this happens with iDOCs? . With RFC do not have this problem.

Best Regards

Julian.