Documentation for the Submit Health Event transaction suggests that DDCCSubmitHealthEventRequest is a batch Bundle of Parameters, but the Bundle entry slice for ddccParameters has cardinality 0..1, which suggests you can only have up to one Parameters resource in the bundle entries.
Documentation for the Submit Health Event transaction suggests that DDCCSubmitHealthEventRequest is a batch Bundle of Parameters, but the Bundle entry slice for ddccParameters has cardinality 0..1, which suggests you can only have up to one Parameters resource in the bundle entries.