On the form, there's the help text "(except in open procedures)", i.e. this is about selective procedures. Therefore, I think this maps to BT-50 Minimum Candidates and BT-51 Maximum Candidates. in TED, there are three fields, but we can explain that, to express an exact number, you set the minimum and maximum to the same number.
I think the last field in TED corresponds to BT-750 Selection Criteria Description which is described as "The brief description of the selection criteria (or criterion), including … how the criteria or criterion will be used to select candidates to be invited for the second stage of the procedure (if a maximum number of candidates was set)."
Extension: https://github.com/open-contracting-extensions/ocds_tenderers_number_extension/blob/master/release-schema.json
On the form, there's the help text "(except in open procedures)", i.e. this is about selective procedures. Therefore, I think this maps to BT-50 Minimum Candidates and BT-51 Maximum Candidates. in TED, there are three fields, but we can explain that, to express an exact number, you set the minimum and maximum to the same number.
I think the last field in TED corresponds to BT-750 Selection Criteria Description which is described as "The brief description of the selection criteria (or criterion), including … how the criteria or criterion will be used to select candidates to be invited for the second stage of the procedure (if a maximum number of candidates was set)."