Recommend changing the definition of the code "complete" in immunization-recommendation-status value set to the following: 

"The recommended vaccine has been administered."

The immunization-recommendation-status value set is given with an example binding on the ImmunizationRecommendation.recommendation.forecastStatus element. I know it's just an example so who cares... but, well, I'm a terminology geek... 

Since the recommendation "should correspond to a single recommended administration", it follows that the forecastStatus should only pertain to that single administration. But the definition of "complete" currently says "The patient is fully protected and no further doses are recommended." That statement scopes not to the individual administration but to an entire vaccine series.

So, if the recommendation pertains to, for instance, Dose 2 of a 3-dose series, you couldn't use the code "complete" to indicate that Dose 2 was done but Dose 3 is still in the future (Dose 3 is held in a separate recommendation in the same immunizationRecommendation resource). Being able to assert that a specific dose has been given successfully is an important part of our use case for this resource in the Aotearoa Immunisation Register (NZ), and having to invent a code other than "complete" to indicate that a  recommendation has been completed will be confusing at best, and trading partners who adopt the example FHIR value set will not be semantically interoperable with us out of the box.