Business Summary - SP/GP - Missing Business Start Date Value

I seem to believe the Business Start Date for Sole Proprietorships and Partnerships may have been left out of the data set for Business Schema ( GET/businesses/{identifier}/documents/{document_key})

Registration Number: FM0664413
On Statement of Registration we see business start date being June 30, 2015

when looking at PDF business summary start date does not return

In the business object on the API I can’t locate an attribute that I think would be Business Start Date