(ROSE) Data Modeler: Not null-null attributes. Changes not applied

[Xavier Escudero]

Dear all,   I'm currently doing a data modelling in Rational Rose 2001. I have created many tables in an Schema.   I have a big problem:   I try to change a table attribute from NULL to NOT NULL or viceversa. In the Specification tab I change it, and I click the Apply button. After that I close the tab specification. If I try to open another time the specification of the changed table the changes dont' appear.   Any suggestion?   Thanks.