UNEDIFACT

I map correctly the EDI IData Object; then I invoke the convertToString, and it works fine.
then I invoke the addICEnvelopeEDIFACT service.
in the expected outDocument variable it returns just the envelope, without the “content” of the EDI message. it also creates an unexpected variable (outDoc) that contains the EDI message without the envelope.

Actualy, I expect to get the envelope with its content.
the service doesn’t return any errors.

do someone know something about this service?