diff --git a/Server/Server/DB/CityDB.cs b/Server/Server/DB/CityDB.cs
index b13c6c6..d4f2703 100644
--- a/Server/Server/DB/CityDB.cs
+++ b/Server/Server/DB/CityDB.cs
@@ -23,6 +23,8 @@ namespace Server.DB
             {
                 using (Context ctx = new Context())
                 {
+                    var country = ctx.Countries.FirstOrDefault(c => c.CountryID == city.Country.CountryID);
+                    ctx.Countries.Attach(country);
                     ctx.Cities.Add(city);
                     ctx.SaveChanges();
                 }
diff --git a/Server/Server/DB/DoctorDB.cs b/Server/Server/DB/DoctorDB.cs
index 3edf0d8..6728126 100644
--- a/Server/Server/DB/DoctorDB.cs
+++ b/Server/Server/DB/DoctorDB.cs
@@ -25,6 +25,15 @@ namespace Server.DB
             {
                 using (Context ctx = new Context())
                 {
+                    var city = ctx.Cities.FirstOrDefault(c => c.CityID == doctor.City.CityID);
+                    var country = ctx.Countries.FirstOrDefault(c => c.CountryID == doctor.City.Country.CountryID);
+                    var salutation = ctx.Salutations.FirstOrDefault(s => s.SalutationID == doctor.Salutation.SalutationID);
+                    var gender = ctx.Genders.FirstOrDefault(g => g.GenderID == doctor.Gender.GenderID);
+
+                    ctx.Cities.Attach(city);
+                    ctx.Countries.Attach(country);
+                    ctx.Genders.Attach(gender);
+                    ctx.Salutations.Attach(salutation);
                     ctx.Doctors.Add(doctor);
                     ctx.SaveChanges();
                 }
diff --git a/Server/Server/DB/ExamDb.cs b/Server/Server/DB/ExamDb.cs
index 7701a92..3836cf5 100644
--- a/Server/Server/DB/ExamDb.cs
+++ b/Server/Server/DB/ExamDb.cs
@@ -25,6 +25,28 @@ namespace Server.DB
             {
                 using (Context ctx = new Context())
                 {
+                    var patient = ctx.Persons.FirstOrDefault(p => p.PersonID == exam.Patient.PersonID);
+                    var pCity = ctx.Cities.FirstOrDefault(c => c.CityID == patient.City.CityID);
+                    var pCountry = ctx.Countries.FirstOrDefault(c => c.CountryID == pCity.Country.CountryID);
+                    var pGender = ctx.Genders.FirstOrDefault(g => g.GenderID == patient.Gender.GenderID);
+                    var pSalutation = ctx.Salutations.FirstOrDefault(s => s.SalutationID == patient.Salutation.SalutationID);
+                    var doctor = ctx.Doctors.FirstOrDefault(d => d.PersonID == exam.Doctor.PersonID);
+                    var dCity = ctx.Cities.FirstOrDefault(c => c.CityID == doctor.City.CityID);
+                    var dCountry = ctx.Countries.FirstOrDefault(c => c.CountryID == dCity.Country.CountryID);
+                    var dGender = ctx.Genders.FirstOrDefault(g => g.GenderID == doctor.Gender.GenderID);
+                    var dSalutation = ctx.Salutations.FirstOrDefault(s => s.SalutationID == doctor.Salutation.SalutationID);
+                    var strain = ctx.Strains.FirstOrDefault(s => s.StrainID == exam.Strain.StrainID);
+
+                    ctx.Persons.Attach(patient);
+                    ctx.Doctors.Attach(doctor);
+                    ctx.Cities.Attach(pCity);
+                    ctx.Cities.Attach(dCity);
+                    ctx.Countries.Attach(dCountry);
+                    ctx.Countries.Attach(pCountry);
+                    ctx.Genders.Attach(dGender);
+                    ctx.Genders.Attach(pGender);
+                    ctx.Salutations.Attach(dSalutation);
+                    ctx.Salutations.Attach(pSalutation);
                     ctx.Exams.Add(exam);
                     ctx.SaveChanges();
                 }
diff --git a/Server/Server/DB/FoodPlaceDB.cs b/Server/Server/DB/FoodPlaceDB.cs
index 75ae883..03bda4f 100644
--- a/Server/Server/DB/FoodPlaceDB.cs
+++ b/Server/Server/DB/FoodPlaceDB.cs
@@ -24,6 +24,11 @@ namespace Server.DB
             {
                 using (Context ctx = new Context())
                 {
+                    var city = ctx.Cities.FirstOrDefault(c => c.CityID == foodplace.City.CityID);
+                    var country = ctx.Countries.FirstOrDefault(c => c.CountryID == foodplace.City.Country.CountryID);
+
+                    ctx.Cities.Attach(city);
+                    ctx.Countries.Attach(country);
                     ctx.FoodPlaces.Add(foodplace);
                     ctx.SaveChanges();
                 }
diff --git a/Server/Server/DB/PersonDB.cs b/Server/Server/DB/PersonDB.cs
index 47abfe1..caf2e5c 100644
--- a/Server/Server/DB/PersonDB.cs
+++ b/Server/Server/DB/PersonDB.cs
@@ -26,6 +26,15 @@ namespace Server.DB
             {
                 using (Context ctx = new Context())
                 {
+                    var city = ctx.Cities.FirstOrDefault(c => c.CityID == person.City.CityID);
+                    var country = ctx.Countries.FirstOrDefault(c => c.CountryID == person.City.Country.CountryID);
+                    var salutation = ctx.Salutations.FirstOrDefault(s => s.SalutationID == person.Salutation.SalutationID);
+                    var gender = ctx.Genders.FirstOrDefault(g => g.GenderID == person.Gender.GenderID);
+
+                    ctx.Cities.Attach(city);
+                    ctx.Countries.Attach(country);
+                    ctx.Genders.Attach(gender);
+                    ctx.Salutations.Attach(salutation);
                     ctx.Persons.Add(person);
                     ctx.SaveChanges();
                 }