Allows Null and prototypes selection problem

[pascalrobert]

When adding a new attribute in a entity, if you select Allows Null and you select the prototype after, the Allows Null control is going back to the default value, so you have to click it again to allow null values for the new attribute.

[avendasora]

Is the prototype defined as not-null? Setting a prototype is going to override any existing settings.

[nullterminated]

This is especially annoying when applying prototypes to a reverse engineered model. All the allows nulls become non null and the app explodes.