This one’s troubled me for years!
When you set a default date (e.g. on new row action) you can’t just enter some merge text to reference a date from another model - you can only select a specific date or a relative date. It’d be so lovely if I could just write ‘{{$Model.MODELNAME.data.0.SOMEDATEFIELD}}’ whereas instead I have to overwrite it in the XML.
Cheers!
Louis