diff --git a/MyINPulse-back/src/main/java/enseirb/myinpulse/model/Entrepreneur.java b/MyINPulse-back/src/main/java/enseirb/myinpulse/model/Entrepreneur.java
index 9763b4e..35b6e71 100644
--- a/MyINPulse-back/src/main/java/enseirb/myinpulse/model/Entrepreneur.java
+++ b/MyINPulse-back/src/main/java/enseirb/myinpulse/model/Entrepreneur.java
@@ -37,7 +37,6 @@ public class Entrepreneur extends User {
     public Entrepreneur() {}
 
     public Entrepreneur(
-            Long idUser,
             String userSurname,
             String username,
             String primaryMail,
@@ -46,7 +45,7 @@ public class Entrepreneur extends User {
             String school,
             String course,
             boolean sneeStatus) {
-        super(idUser, userSurname, username, primaryMail, secondaryMail, phoneNumber);
+        super(userSurname, username, primaryMail, secondaryMail, phoneNumber);
         this.school = school;
         this.course = course;
         this.sneeStatus = sneeStatus;
diff --git a/MyINPulse-back/src/main/java/enseirb/myinpulse/model/User.java b/MyINPulse-back/src/main/java/enseirb/myinpulse/model/User.java
index 4d7f32f..37a551d 100644
--- a/MyINPulse-back/src/main/java/enseirb/myinpulse/model/User.java
+++ b/MyINPulse-back/src/main/java/enseirb/myinpulse/model/User.java
@@ -28,6 +28,8 @@ public class User {
 
     public User() {}
 
+    // TODO: this should be removed as we shouldn't be able to chose the ID. Leaving it for
+    // compatibility purposes, as soon as it's not used anymore, delete it
     public User(
             Long idUser,
             String userSurname,
@@ -43,6 +45,19 @@ public class User {
         this.phoneNumber = phoneNumber;
     }
 
+    public User(
+            String userSurname,
+            String userName,
+            String primaryMail,
+            String secondaryMail,
+            String phoneNumber) {
+        this.userSurname = userSurname;
+        this.userName = userName;
+        this.primaryMail = primaryMail;
+        this.secondaryMail = secondaryMail;
+        this.phoneNumber = phoneNumber;
+    }
+
     public Long getIdUser() {
         return idUser;
     }
diff --git a/MyINPulse-back/src/main/java/enseirb/myinpulse/service/AdminApiService.java b/MyINPulse-back/src/main/java/enseirb/myinpulse/service/AdminApiService.java
index 9f42d0e..38cb9e6 100644
--- a/MyINPulse-back/src/main/java/enseirb/myinpulse/service/AdminApiService.java
+++ b/MyINPulse-back/src/main/java/enseirb/myinpulse/service/AdminApiService.java
@@ -91,7 +91,9 @@ public class AdminApiService {
             newProject.getProjectAdministrator().updateListProject(newProject);
         }
         if (newProject.getEntrepreneurProposed() != null) {
-            newProject.getEntrepreneurProposed().setProjectProposed(newProject);
+            Entrepreneur proposed = newProject.getEntrepreneurProposed();
+            proposed.setProjectProposed(newProject);
+            proposed.setProjectParticipation(newProject);
         }
         newProject
                 .getListEntrepreneurParticipation()
diff --git a/MyINPulse-back/src/test/java/enseirb/myinpulse/AdminApiServiceTest.java b/MyINPulse-back/src/test/java/enseirb/myinpulse/AdminApiServiceTest.java
index abd21fb..676dfc9 100644
--- a/MyINPulse-back/src/test/java/enseirb/myinpulse/AdminApiServiceTest.java
+++ b/MyINPulse-back/src/test/java/enseirb/myinpulse/AdminApiServiceTest.java
@@ -5,10 +5,12 @@ import static enseirb.myinpulse.model.ProjectDecisionValue.*;
 import static org.junit.jupiter.api.Assertions.*;
 
 import enseirb.myinpulse.model.Administrator;
+import enseirb.myinpulse.model.Entrepreneur;
 import enseirb.myinpulse.model.Project;
 import enseirb.myinpulse.model.ProjectDecision;
 import enseirb.myinpulse.service.AdminApiService;
 import enseirb.myinpulse.service.database.AdministratorService;
+import enseirb.myinpulse.service.database.EntrepreneurService;
 import enseirb.myinpulse.service.database.ProjectService;
 
 import org.junit.jupiter.api.BeforeAll;
@@ -26,13 +28,16 @@ import java.util.List;
 @Transactional
 public class AdminApiServiceTest {
     private static long administratorid;
+    private static Administrator administrator;
+    private static Entrepreneur entrepreneur;
     @Autowired private AdminApiService adminApiService;
     @Autowired private ProjectService projectService;
 
     @BeforeAll
     static void setup(
             @Autowired AdministratorService administratorService,
-            @Autowired ProjectService projectService) {
+            @Autowired ProjectService projectService,
+            @Autowired EntrepreneurService entrepreneurService) {
         administratorService.addAdministrator(
                 new Administrator(
                         "admin",
@@ -40,7 +45,7 @@ public class AdminApiServiceTest {
                         "testAdminEmpty@example.com",
                         "testAdmin@example.com",
                         ""));
-        Administrator a =
+        administrator =
                 administratorService.addAdministrator(
                         new Administrator(
                                 "admin2",
@@ -48,7 +53,18 @@ public class AdminApiServiceTest {
                                 "testAdminFull@example.com",
                                 "testAdmin@example.com",
                                 ""));
-        administratorid = a.getIdUser();
+        administratorid = administrator.getIdUser();
+        entrepreneur =
+                new Entrepreneur(
+                        "JeSuisUnEntrepreneurDeCompet",
+                        "EtUé",
+                        "Entrepreneur@inpulse.com",
+                        "mail2",
+                        "phone",
+                        "Ensimag    nan jdeconne ENSEIRB (-matmeca mais on s'en fout)",
+                        "info ofc",
+                        false);
+        entrepreneurService.addEntrepreneur(entrepreneur);
         projectService.addNewProject(
                 new Project(
                         "sampleProjectAdminApiService",
@@ -161,6 +177,41 @@ public class AdminApiServiceTest {
         assertEquals(1, IterableToList(this.adminApiService.getPendingProjects()).size());
     }
 
+    @Test
+    void addProjectToAdmin() {
+        assertEquals(0, administrator.getListProject().size());
+        Project p1 = new Project("assProjectToAdmin", null, LocalDate.now(), ACTIVE, administrator);
+        this.adminApiService.addNewProject(p1);
+        assertEquals(1, administrator.getListProject().size());
+    }
+
+    @Test
+    void addProjectToUser() {
+        assertNull(entrepreneur.getProjectParticipation());
+        Project p1 =
+                new Project("assProjectToAdmin", null, LocalDate.now(), ACTIVE, null, entrepreneur);
+        this.adminApiService.addNewProject(p1);
+        assertEquals(p1, entrepreneur.getProjectParticipation());
+    }
+
+    @Test
+    void addProjectWithManyUsers() {
+        Entrepreneur e1 = new Entrepreneur();
+        Entrepreneur e2 = new Entrepreneur();
+        Entrepreneur e3 = new Entrepreneur();
+        assertNull(e1.getProjectParticipation());
+        assertNull(e2.getProjectParticipation());
+        assertNull(e3.getProjectParticipation());
+        Project p1 = new Project("assProjectToAdmin", null, LocalDate.now(), ACTIVE, null, null);
+        p1.updateListEntrepreneurParticipation(e1);
+        p1.updateListEntrepreneurParticipation(e2);
+        p1.updateListEntrepreneurParticipation(e3);
+        this.adminApiService.addNewProject(p1);
+        assertEquals(p1, e1.getProjectParticipation());
+        assertEquals(p1, e2.getProjectParticipation());
+        assertEquals(p1, e3.getProjectParticipation());
+    }
+
     @Test
     void addDuplicateProject() {
         Project p1 =