Every ISBN needs a record with the agency that issued it: the title, the author, the form of the book and the date it comes out. The guide fills these from the edition, field by field, with copy buttons.
The studio has guides for e-isbn.pl (Poland), Bowker (the US) and Nielsen (the UK and Ireland). It never fills in the agency's form for you.
What you need: the edition's details, a publication date and your imprint.