EDU-9384: T220 issues in code snippets fixed

Author: k-s-popova

Customization/T220/CodeSnippets/Step1.1.1/RSSVWorkOrderEntry.cs

@@ -1,5 +1,6 @@
 using PX.Data;
 using PX.Data.BQL.Fluent;
+using System;
 
 namespace PhoneRepairShop
 {

Customization/T220/CodeSnippets/Step1.2.1/RSSVWorkOrderEntry.cs

@@ -1,5 +1,6 @@
 using PX.Data;
 using PX.Data.BQL.Fluent;
+using System;
 
 namespace PhoneRepairShop
 {

Customization/T220/CodeSnippets/Step1.2.2/RSSVWorkOrderEntry.cs

@@ -3,6 +3,7 @@
 ////////// The added code
 using PX.Objects.IN;
 ////////// The end of added code
+using System;
 
 namespace PhoneRepairShop
 {

Customization/T220/CodeSnippets/Step1.3.1/RSSVWorkOrderEntry.cs

@@ -4,6 +4,7 @@
 ////////// The end of added code
 using PX.Data.BQL.Fluent;
 using PX.Objects.IN;
+using System;
 
 namespace PhoneRepairShop
 {

Customization/T220/CodeSnippets/Step1.3.2/RSSVWorkOrderEntry.cs

@@ -2,6 +2,7 @@
 using PX.Data.BQL;
 using PX.Data.BQL.Fluent;
 using PX.Objects.IN;
+using System;
 
 namespace PhoneRepairShop
 {

Customization/T220/CodeSnippets/Step2.1.1/RSSVSetupMaint.cs

@@ -1,6 +1,7 @@
 using System;
 using PX.Data;
 using PX.Data.BQL.Fluent;
+using System;
 
 namespace PhoneRepairShop
 {
@@ -10,5 +11,23 @@ public class RSSVSetupMaint : PXGraph<RSSVSetupMaint>
         public PXCancel<RSSVSetup> Cancel = null!;
 
         public SelectFrom<RSSVSetup>.View Setup = null!;
-    }
+
+
+        public PXFilter<MasterTable> MasterView;
+		public PXFilter<DetailsTable> DetailsView;
+
+		[Serializable]
+		public class MasterTable : PXBqlTable, IBqlTable
+		{
+
+		}
+
+		[Serializable]
+		public class DetailsTable : PXBqlTable, IBqlTable
+		{
+
+		}
+
+
+	}
 }

Customization/T220/CodeSnippets/Step2.1.4/RSSVWorkOrderEntry.cs

@@ -2,6 +2,7 @@
 using PX.Data.BQL;
 using PX.Data.BQL.Fluent;
 using PX.Objects.IN;
+using System;
 
 namespace PhoneRepairShop
 {