_validatePerItem() {
      const objectTag = self.toNameTag;

      return self.annotation.regions.every((reg) => {
        const result = reg.results.find((s) => s.from_name === self);

        if (!result?.hasValue) {
          return true;
        }
        const value = result.mainValue;
        const isValid = self.validateValue(value);

        if (!isValid) {
          objectTag.setCurrentItem(reg.item_index);
          return false;
        }
        return true;
      });
    }
Validates all values related to the current classification per item (Multi Items Segmentation).

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

@returns {boolean}
@private