Hello @emolotel
In this case, as the fieldname3 field depends on the values of other two fields in the form, you should use a calculated field as intermediary to define the dependencies.
For example, you can insert a calculated field with the equation:
IF(AND(fieldname1 == 1, fieldname2 == 2), 1, 0)
and then, in the settings of the calculated field, you can define the dependency as follows:
– if the value is equal to 1, then, select the fieldname3 from the list of dependent fields.
Note: as the calculated field is used as auxiliary, you can tick the checkbox: “Hide Field From Public Page” in its settings.
More information about the dependencies, visiting the following link:
https://cff.dwbooster.com/documentation#dependencies
Best regards.