Table cells are modeled using a BodyLine object.
This objects is design to represent components that are in the table.
It has min and max attributes of type double. This fits the "InputNumber" type of component.
Unfortunately, "Datepicker" component also have min and max attributes, but of String type.
Thus is it impossible to set the min and max attribute for BodyLine objects that represent a "Datepicker" component.
As far as I know, this property is not used in the Lunatic library yet, so it's not a big deal for now.
I don't see an easy quick solution to this since attribute names are the same (even there should be a workaround to do it).
A better solution would to use polymorphism instead of the BodyLine object to put proper components in table cells.
This would also improve the modeling of tables. For instance, Lunatic-Model allows to create a component of type "InputNumber" and set it a maxLength, which would be invalid for Lunatic.