Can´t create validation rule for blueprint if it is a number

Can´t create validation rule for blueprint if it is a number

Hello, i´m trying to create a blueprint, when i want to set up a transition and add a new field in "during phase", Crm don´t let me set up rule as field validation criteria. I can choose any number field choose criteria and message but whan i click on Done nothing happens.
When i try to check field validation criteria for text or check everything works perfectly.
Thanks for your help