new setting for IDEa , I did one simple addition and deleted it just to create new PR no more .

Author: KrivenkoAlexander

src/main/java/ru/mystamps/web/feature/series/sale/AddSeriesSalesForm.java

@@ -22,6 +22,7 @@
 import org.hibernate.validator.constraints.URL;
 import org.springframework.format.annotation.DateTimeFormat;
 import ru.mystamps.web.dao.dto.Currency;
+import ru.mystamps.web.support.beanvalidation.FieldsMismatch;
 import ru.mystamps.web.support.beanvalidation.Group;
 import ru.mystamps.web.validation.ValidationRules;
 
@@ -31,8 +32,10 @@
 import java.math.BigDecimal;
 import java.util.Date;
 
+// @todo #503 Add integration test to ensure that seller and buyer are different
 @Getter
 @Setter
+@FieldsMismatch(first = "sellerId", second = "buyerId", message = "{seller.buyer.match}")
 public class AddSeriesSalesForm implements AddSeriesSalesDto {
 
 	@DateTimeFormat(pattern = "dd.MM.yyyy")

src/main/resources/ru/mystamps/i18n/ValidationMessages.properties

@@ -48,6 +48,7 @@ login.repetition_chars = Login must not contain repetition of hyphen, dot or und
 
 password.mismatch = Password mismatch
 password.login.match = Password and login must be different
+seller.buyer.match = Seller and buyer must be different
 
 name.invalid = Name must consist only letters, hyphen or spaces