I've built a custom validator. The problem is I'm setting the values like

entity.Fields[ProjectFields.Id.Name].CurrentValue = -1.5m;

The problem with this approach is the ValidateFieldValue method wont be called.

Is there any to validate the values ?

I'm using the 2.6 version

I'd suggest not setting the value through CurrentValue, but I think you have a good reason for doing this.

A workaround is to to validate the Entity, using entity.ValidateEntity() and there you should validate the entity's fields.

use the SetNewFieldValue() method on the entity instead of setting CurrentValue.