diff --git a/modules/axelor-open-suite/axelor-purchase/src/main/java/com/axelor/apps/purchase/web/PurchaseRequestController.java b/modules/axelor-open-suite/axelor-purchase/src/main/java/com/axelor/apps/purchase/web/PurchaseRequestController.java
index c8e4ab3..dfac1e2 100644
--- a/modules/axelor-open-suite/axelor-purchase/src/main/java/com/axelor/apps/purchase/web/PurchaseRequestController.java
+++ b/modules/axelor-open-suite/axelor-purchase/src/main/java/com/axelor/apps/purchase/web/PurchaseRequestController.java
@@ -20,7 +20,9 @@ package com.axelor.apps.purchase.web;
 import com.axelor.apps.message.service.MailAccountService;
 import com.axelor.apps.purchase.db.PurchaseOrder;
 import com.axelor.apps.purchase.db.PurchaseRequest;
+import com.axelor.apps.purchase.db.PurchaseRequestLine;
 import com.axelor.apps.purchase.db.repo.PurchaseRequestRepository;
+import com.axelor.apps.purchase.db.repo.PurchaseRequestLineRepository;
 import com.axelor.apps.purchase.exception.IExceptionMessage;
 import com.axelor.apps.purchase.service.PurchaseRequestService;
 import com.axelor.apps.tool.StringTool;
@@ -241,5 +243,39 @@ public class PurchaseRequestController {
   public void sendEmail(String email,String subject,String body){
     EmailUtil.sendEmail(mailAccountService, email,subject, body);    
   }
+  
+  public void checkProductFamily(ActionRequest request, ActionResponse response) throws AxelorException {
+
+      Long id = request.getContext().asType(PurchaseRequest.class).getId();
+      PurchaseRequest purchaseRequest  = Beans.get(PurchaseRequestRepository.class).find(id);
+      String productFamily = purchaseRequest.getFamilleProduit().getName().toString();
+      Integer size = 0;
+      
+      List<PurchaseRequestLine> purchaseRequestLines  = 
+        Beans.get(PurchaseRequestLineRepository.class)
+        .all()
+        .filter("self.newProduct = ?1 and self.purchaseRequest = ?2",false,id)
+        .fetch();
+
+      if (purchaseRequestLines  != null){ 
+        
+             size = purchaseRequestLines.stream()
+             .collect(Collectors.groupingBy(fa -> fa.getProduct().getFamilleProduit())).size();
+
+      }         
+      if (size > 1){
+            response.setError(I18n.get("Lines of expression of needs are not of the same family :") +productFamily);
+            //return;    
+      }
+      if (size == 1){
+        long idOfFamily = purchaseRequestLines.stream()
+        .collect(Collectors.groupingBy(fa -> fa.getProduct().getFamilleProduit().getId()))
+        .keySet().stream().collect(Collectors.toList()).get(0);
+
+        if (purchaseRequest.getFamilleProduit().getId() != idOfFamily){
+          response.setError(I18n.get("Lines of expression of needs are not of the same family :") +productFamily);   
+        }
+      }    
+  }
 
 }