Your question doesn't really make sense.
A filter is used for limiting the view to selected records, which has
nothing to do with generating data in fields of tables.
I think that what you want is to set up your ID number field in the database
as an AUTONUMBER type. That way, every time a new record is added, that
record will get the next available ID number.
> Under the data tab of the properties, what do I need to type in the "filter"
> field in order to have an ID number automatically generated by my back-end
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> LV