diff --git a/ServiceStation/ServiceStation.sln b/ServiceStation/ServiceStation.sln
index d6a2237..750f0e7 100644
--- a/ServiceStation/ServiceStation.sln
+++ b/ServiceStation/ServiceStation.sln
@@ -5,7 +5,9 @@ VisualStudioVersion = 17.6.33717.318
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ServiceStationDataModels", "ServiceStationDataModels\ServiceStationDataModels.csproj", "{431172B6-C074-45F3-8064-4D8D7F3F9FD2}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ServiceStationsDataBaseImplement", "ServiceStationsDataBaseImplement\ServiceStationsDataBaseImplement.csproj", "{71AAE393-32B8-4E7C-8EC2-C0D98F5E3FCF}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ServiceStationsDataBaseImplement", "ServiceStationsDataBaseImplement\ServiceStationsDataBaseImplement.csproj", "{71AAE393-32B8-4E7C-8EC2-C0D98F5E3FCF}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ServiceStationContracts", "ServiceStationContracts\ServiceStationContracts.csproj", "{6758A476-8AC7-4558-AC45-E2EDBAA71C59}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -21,6 +23,10 @@ Global
 		{71AAE393-32B8-4E7C-8EC2-C0D98F5E3FCF}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{71AAE393-32B8-4E7C-8EC2-C0D98F5E3FCF}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{71AAE393-32B8-4E7C-8EC2-C0D98F5E3FCF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6758A476-8AC7-4558-AC45-E2EDBAA71C59}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6758A476-8AC7-4558-AC45-E2EDBAA71C59}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6758A476-8AC7-4558-AC45-E2EDBAA71C59}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6758A476-8AC7-4558-AC45-E2EDBAA71C59}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/ServiceStation/ServiceStationsDataBaseImplement/ServiceStationsDataBaseImplement.csproj b/ServiceStation/ServiceStationsDataBaseImplement/ServiceStationsDataBaseImplement.csproj
index 5f4e056..b9635d0 100644
--- a/ServiceStation/ServiceStationsDataBaseImplement/ServiceStationsDataBaseImplement.csproj
+++ b/ServiceStation/ServiceStationsDataBaseImplement/ServiceStationsDataBaseImplement.csproj
@@ -16,6 +16,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\ServiceStationContracts\ServiceStationContracts.csproj" />
     <ProjectReference Include="..\ServiceStationDataModels\ServiceStationDataModels.csproj" />
   </ItemGroup>