There are multiple options. If this is only a pass-through interface and you are not storing the MDM data in HealthShare ECR, then you can use DTL to convert the MDM to ORU. If you are storing the data in HS, then the HS converts the HL7 into SDA and stores the SDA. You can then use push framework to transform the SDA into ORU message for the receiving data source.
Note that HS interprests ORU as "RES" type of events and MDM as "DOC" type of events. For discharge summary and notes, these should be sent to HS as MDM.