substitution property
substitution Indicates whether or not substitution was made as part of the dispense. In some cases, substitution will be expected but does not happen, in other cases substitution is not expected but does happen. This block explains what substitution did or did not happen and why. If nothing is specified, substitution was not done.
Implementation
MedicationDispenseSubstitution? get substitution =>
throw _privateConstructorUsedError;