Обратимся к встроенной справке
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f.OBJECTID
This function returns a string in the "form xxx" format, where xxx is the name or number of the application object.
String:=f.OBJECTID([UseNames])
String
Data type: text or code
f
Data type: form
UseNames
Data type: boolean
The UseNames parameter is optional. If it is set to TRUE (default value) or if it is empty, the returned string contains references to field names in the table that the record is associated with. If the parameter is set to FALSE, field numbers are used instead.