diff --git a/src/main/java/io/gmss/fiscad/entities/infocad/metier/Enquete.java b/src/main/java/io/gmss/fiscad/entities/infocad/metier/Enquete.java
index 70d80ff..e779424 100644
--- a/src/main/java/io/gmss/fiscad/entities/infocad/metier/Enquete.java
+++ b/src/main/java/io/gmss/fiscad/entities/infocad/metier/Enquete.java
@@ -27,6 +27,7 @@ import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
 import lombok.NoArgsConstructor;
+import org.hibernate.annotations.Formula;
 
 import java.io.Serializable;
 import java.time.LocalDate;
@@ -183,6 +184,14 @@ public class Enquete extends BaseEntity implements Serializable {
     private Integer nbreIndivisiaire;
     private String autreAdresse;
     private Float superficie ;
+    @Formula("""
+        (
+           SELECT COUNT(DISTINCT (bat.id))
+           FROM enquete e
+           join batiment bat on bat.parcelle_id =e.parcelle_id
+           WHERE bat.parcelle_id = parcelle_id
+        )
+    """)
     private Integer nbreBatiment;
     private Integer nbrePiscine;
     private Long montantMensuelleLocation;
diff --git a/src/main/java/io/gmss/fiscad/entities/rfu/metier/Participer.java b/src/main/java/io/gmss/fiscad/entities/rfu/metier/Participer.java
index d121a29..f08bd1b 100644
--- a/src/main/java/io/gmss/fiscad/entities/rfu/metier/Participer.java
+++ b/src/main/java/io/gmss/fiscad/entities/rfu/metier/Participer.java
@@ -22,7 +22,15 @@ import java.time.LocalDate;
 @Data
 @NoArgsConstructor
 @AllArgsConstructor
-@Where(clause = " deleted = false")
+//@Where(clause = " deleted = false")
+@Table(
+        uniqueConstraints = {
+                @UniqueConstraint(
+                        name = "uk_participer_equipe_user",
+                        columnNames = {"equipe_id", "user_id"}
+                )
+        }
+)
 public class Participer extends BaseEntity implements Serializable {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
diff --git a/src/main/java/io/gmss/fiscad/implementations/rfu/metier/ParticiperServiceImpl.java b/src/main/java/io/gmss/fiscad/implementations/rfu/metier/ParticiperServiceImpl.java
index 05ee022..ae785bb 100644
--- a/src/main/java/io/gmss/fiscad/implementations/rfu/metier/ParticiperServiceImpl.java
+++ b/src/main/java/io/gmss/fiscad/implementations/rfu/metier/ParticiperServiceImpl.java
@@ -2,6 +2,7 @@ package io.gmss.fiscad.implementations.rfu.metier;
 
 import io.gmss.fiscad.entities.infocad.metier.Parcelle;
 import io.gmss.fiscad.entities.rfu.metier.Participer;
+import io.gmss.fiscad.exceptions.ApplicationException;
 import io.gmss.fiscad.exceptions.BadRequestException;
 import io.gmss.fiscad.exceptions.NotFoundException;
 import io.gmss.fiscad.interfaces.rfu.metier.ParticiperService;
@@ -41,12 +42,22 @@ public class ParticiperServiceImpl implements ParticiperService {
                 throw new BadRequestException("Impossible de créer la participation: L'équipe doit être précisée.");
         }
 
+
+
         if (participerPaylaodWeb.getUserId() == null) {
             throw new BadRequestException("Impossible de créer la participation : Le participant doit être précisé.");
         }else {
             if(!userRepository.existsById(participerPaylaodWeb.getUserId()))
                 throw new BadRequestException("Impossible de créer un nouveau participer: Le participant doit être précisé.");
         }
+
+        if (participerRepository.existsByEquipeIdAndUserId(
+                participerPaylaodWeb.getEquipeId(),
+                participerPaylaodWeb.getUserId())) {
+            throw new ApplicationException("Cet utilisateur participe déjà à cette équipe.");
+        }
+
+
         Participer participer= entityFromPayLoadService.getParticiperFromPayLoadWeb(participerPaylaodWeb);
         participer=  participerRepository.save(participer);
 
diff --git a/src/main/java/io/gmss/fiscad/persistence/repositories/rfu/metier/ParticiperRepository.java b/src/main/java/io/gmss/fiscad/persistence/repositories/rfu/metier/ParticiperRepository.java
index 465939d..74f9232 100644
--- a/src/main/java/io/gmss/fiscad/persistence/repositories/rfu/metier/ParticiperRepository.java
+++ b/src/main/java/io/gmss/fiscad/persistence/repositories/rfu/metier/ParticiperRepository.java
@@ -12,6 +12,7 @@ import java.util.List;
 import java.util.Optional;
 
 public interface ParticiperRepository extends JpaRepository<Participer, Long> {
+    boolean existsByEquipeIdAndUserId(Long equipeId, Long userId);
     @Query("""
     SELECT new io.gmss.fiscad.paylaods.request.crudweb.ParticiperPayloadWeb(
         p.id,