_validatePerRegion() {
      const objectTag = self.toNameTag;

      for (const reg of objectTag.allRegs) {
        const value = reg.results.find((s) => s.from_name === self)?.mainValue;
        const isValid = self.validateValue(value);

        if (!isValid) {
          self.annotation.selectArea(reg);
          return false;
        }
      }

      return true;
    }
Validates all values related to the current classification per region.

- This method should not be overridden.
- It is used only in validate method of the ClassificationBase mixin.

@returns {boolean}
@private