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It has been introduced as beta in 2.21.1 - Release Notes#Version2.21.1 and as GA in version 2.24.7 - Release Notes#Version2.24.7
As with all the "smart" fields in ConfiForms this field is about linking forms together, but with one important difference - it allows you to ADD new records into the referenced form directly and in "one go"
Here is what we mean
Consider a simple form with 2 fields named "participantsForm"
- Name (text)
- Mark (numeric)
And another form that we want to use as a database to store our tests - "testsForm"