In the documentation for HL7 there is an interesting chapter called Using Dynamic Data Validation and it is located here. To explain how this is to be done you first have to go into the HL7 configuration explorer and disable the data validation.

This will allow data to arrive without being checked against its Enumeration:

This however will not disable the structure validation that is the pain point of most HL7 implementations.

Once data is structurally validated, then the message arrives into the orchestration you then start to use the Business Rules engine to validate the data

This is the starting point of how you enable Dynamic Data Validation using the HL7 accelerator