diff --git a/src/main/java/com/microsoft/graph/models/extensions/Multipart.java b/src/main/java/com/microsoft/graph/models/extensions/Multipart.java
index e0597873aeb..b2fc5fd810d 100644
--- a/src/main/java/com/microsoft/graph/models/extensions/Multipart.java
+++ b/src/main/java/com/microsoft/graph/models/extensions/Multipart.java
@@ -7,6 +7,8 @@
 import java.math.BigInteger;
 import java.security.SecureRandom;
 
+import com.microsoft.graph.options.HeaderOption;
+
 /**
  * Helper for submitting multipart data
  * 
@@ -29,12 +31,20 @@ public Multipart() {
 	
 	/**
 	 * Get the multipart boundary for use in the request header
-	 * @return The multipart boundary
+	 * @return the multipart boundary
 	 */
 	public String boundary() {
 		return boundary;
 	}
 	
+	/**
+	 * Get the Content-Type header to send the multipart request
+	 * @return the multipart header option
+	 */
+	public HeaderOption header() {
+		return new HeaderOption("Content-Type", "multipart/form-data; boundary=\"" + boundary + "\"");
+	}
+	
 	/**
 	 * Add a string part to the multipart body
 	 * @param name The name of the part
@@ -75,16 +85,6 @@ public void addHtmlPart(String name, String content) throws IOException {
 		addPart(name, "text/html", content);
 	}
 	
-	/**
-	 * Add an image part to the multipart body
-	 * @param name The name of the part
-	 * @param imageFile The image file
-	 * @throws IOException Throws an exception if the output stream cannot be written to
-	 */
-	public void addImagePart(String name, java.io.File imageFile) throws IOException {
-		addFilePart(name, "image/jpeg", imageFile);
-	}
-	
 	/**
 	 * Add a file part to the multipart body
 	 * @param name The name of the part
diff --git a/src/main/java/com/microsoft/graph/models/extensions/PlannerAssignment.java b/src/main/java/com/microsoft/graph/models/extensions/PlannerAssignment.java
index 6fd8ec53cfe..b5aec3a6986 100644
--- a/src/main/java/com/microsoft/graph/models/extensions/PlannerAssignment.java
+++ b/src/main/java/com/microsoft/graph/models/extensions/PlannerAssignment.java
@@ -23,5 +23,7 @@
  * The class for the Planner Assignment.
  */
 public class PlannerAssignment extends BasePlannerAssignment {
-
+	public PlannerAssignment() {
+		oDataType = "#microsoft.graph.plannerAssignment";
+	}
 }
diff --git a/src/main/java/com/microsoft/graph/models/extensions/PlannerBucket.java b/src/main/java/com/microsoft/graph/models/extensions/PlannerBucket.java
index 6219668fdf0..c4857f478da 100644
--- a/src/main/java/com/microsoft/graph/models/extensions/PlannerBucket.java
+++ b/src/main/java/com/microsoft/graph/models/extensions/PlannerBucket.java
@@ -31,4 +31,8 @@ public class PlannerBucket extends BasePlannerBucket {
     @SerializedName("@odata.etag")
     @Expose
     public String etag;
+    
+    public PlannerBucket() {
+    	oDataType = "#microsoft.graph.plannerBucket";
+    }
 }
diff --git a/src/main/java/com/microsoft/graph/models/extensions/PlannerChecklistItem.java b/src/main/java/com/microsoft/graph/models/extensions/PlannerChecklistItem.java
index 774d097de72..c2772d75b0a 100644
--- a/src/main/java/com/microsoft/graph/models/extensions/PlannerChecklistItem.java
+++ b/src/main/java/com/microsoft/graph/models/extensions/PlannerChecklistItem.java
@@ -23,5 +23,8 @@
  * The class for the Planner Checklist Item.
  */
 public class PlannerChecklistItem extends BasePlannerChecklistItem {
-
+	
+	public PlannerChecklistItem() {
+		oDataType = "#microsoft.graph.plannerChecklistItem";
+	}
 }
diff --git a/src/main/java/com/microsoft/graph/models/extensions/PlannerExternalReference.java b/src/main/java/com/microsoft/graph/models/extensions/PlannerExternalReference.java
index 626f39a9830..4741118473c 100644
--- a/src/main/java/com/microsoft/graph/models/extensions/PlannerExternalReference.java
+++ b/src/main/java/com/microsoft/graph/models/extensions/PlannerExternalReference.java
@@ -23,5 +23,7 @@
  * The class for the Planner External Reference.
  */
 public class PlannerExternalReference extends BasePlannerExternalReference {
-
+	public PlannerExternalReference() {
+		oDataType = "#microsoft.graph.plannerExternalReference";
+	}
 }
diff --git a/src/main/java/com/microsoft/graph/models/extensions/PlannerTask.java b/src/main/java/com/microsoft/graph/models/extensions/PlannerTask.java
index 4e2271a1d3e..4b46d93aa11 100644
--- a/src/main/java/com/microsoft/graph/models/extensions/PlannerTask.java
+++ b/src/main/java/com/microsoft/graph/models/extensions/PlannerTask.java
@@ -32,4 +32,8 @@ public class PlannerTask extends BasePlannerTask {
     @SerializedName("@odata.etag")
     @Expose
     public String etag;
+    
+    public PlannerTask() {
+    	oDataType = "#microsoft.graph.plannerTask";
+    }
 }
diff --git a/src/main/java/com/microsoft/graph/models/extensions/PlannerTaskDetails.java b/src/main/java/com/microsoft/graph/models/extensions/PlannerTaskDetails.java
index 053589e632b..75217d35288 100644
--- a/src/main/java/com/microsoft/graph/models/extensions/PlannerTaskDetails.java
+++ b/src/main/java/com/microsoft/graph/models/extensions/PlannerTaskDetails.java
@@ -25,11 +25,15 @@
  * The class for the Planner Task Details.
  */
 public class PlannerTaskDetails extends BasePlannerTaskDetails {
-
+	
 	/**
      * The Etag.
      */
     @SerializedName("@odata.etag")
     @Expose
     public String etag;
+    
+    public PlannerTaskDetails() {
+    	oDataType = "#microsoft.graph.plannerTaskDetails";
+    }
 }
diff --git a/src/test/java/com/microsoft/graph/functional/OneNoteTests.java b/src/test/java/com/microsoft/graph/functional/OneNoteTests.java
index d96f153c7ef..8acb59680d2 100644
--- a/src/test/java/com/microsoft/graph/functional/OneNoteTests.java
+++ b/src/test/java/com/microsoft/graph/functional/OneNoteTests.java
@@ -5,6 +5,7 @@
 import com.microsoft.graph.requests.extensions.IOnenotePageCollectionPage;
 import com.microsoft.graph.requests.extensions.IOnenoteSectionCollectionPage;
 import com.microsoft.graph.requests.extensions.ISectionGroupCollectionPage;
+import com.microsoft.graph.serializer.AdditionalDataManager;
 import com.microsoft.graph.requests.extensions.IOnenoteRequestBuilder;
 import com.microsoft.graph.models.extensions.Multipart;
 import com.microsoft.graph.models.extensions.Notebook;
@@ -403,14 +404,12 @@ public void testMultipartPost(){
         	File pdfFile = new File("src/test/resources/document.pdf");
         	
         	multipart.addHtmlPart("Presentation", htmlContent);
-        	multipart.addImagePart("hamilton", imgFile);
+        	multipart.addFilePart("hamilton", "image/jpg", imgFile);
         	multipart.addFilePart("metadata", "application/pdf", pdfFile);
         	
             // Add multipart request header
             List<Option> options = new ArrayList<Option>();
-            options.add(new HeaderOption(
-            		"Content-Type", "multipart/form-data; boundary=\"" + multipart.boundary() + "\""
-            		));
+            options.add(multipart.header());
             
             // Post the multipart content
             OnenotePage page = orb
diff --git a/src/test/java/com/microsoft/graph/functional/PlannerTests.java b/src/test/java/com/microsoft/graph/functional/PlannerTests.java
index 8af8d521e3a..d79add602a3 100644
--- a/src/test/java/com/microsoft/graph/functional/PlannerTests.java
+++ b/src/test/java/com/microsoft/graph/functional/PlannerTests.java
@@ -125,10 +125,6 @@ public void testUpdateTask() throws InterruptedException {
 
         PlannerAssignment assignment = new PlannerAssignment();
         assignment.orderHint = " !";
-        AdditionalDataManager assignmentAdditionalData = assignment.additionalDataManager();
-        assignmentAdditionalData.put("@odata.type", new JsonPrimitive("#microsoft.graph.plannerAssignment"));
-        //assignment.oDataType = "#microsoft.graph.plannerAssignment";
-
         PlannerAssignments a2 = new PlannerAssignments();
         a2.put(me.id, assignment);
         task.assignments = a2;
@@ -157,11 +153,12 @@ public void testUpdateTaskDetailsChecklist() throws InterruptedException {
         JsonObject data = new JsonObject();
         Gson gson = new Gson();
 
+        Thread.sleep(2000);
+        
         PlannerChecklistItem checklistItem1 = new PlannerChecklistItem();
         checklistItem1.orderHint = "  !!";
         checklistItem1.isChecked = true;
         checklistItem1.title = "C1";
-        checklistItem1.additionalDataManager().put("@odata.type", new JsonPrimitive("microsoft.graph.plannerChecklistItem"));
         JsonElement checklist1Json = gson.toJsonTree(checklistItem1);
         data.add(uuid, checklist1Json);
 
@@ -169,7 +166,6 @@ public void testUpdateTaskDetailsChecklist() throws InterruptedException {
         checklistItem2.orderHint = " !";
         checklistItem2.isChecked = false;
         checklistItem2.title = "C2";
-        checklistItem2.additionalDataManager().put("@odata.type", new JsonPrimitive("microsoft.graph.plannerChecklistItem"));
         JsonElement checklist2Json = gson.toJsonTree(checklistItem2);
         data.add(UUID.randomUUID().toString(), checklist2Json);
 
@@ -177,12 +173,10 @@ public void testUpdateTaskDetailsChecklist() throws InterruptedException {
         checklistItem3.orderHint = "   !!!";
         checklistItem3.isChecked = false;
         checklistItem3.title = "C3";
-        checklistItem3.additionalDataManager().put("@odata.type", new JsonPrimitive("microsoft.graph.plannerChecklistItem"));
         JsonElement checklist3Json = gson.toJsonTree(checklistItem3);
         data.add(UUID.randomUUID().toString(), checklist3Json);
 
         AdditionalDataManager dataManager = details.additionalDataManager();
-        details.oDataType = "#microsoft.graph.plannerTaskDetails";
         dataManager.put("checklist", data);
 
         PlannerTaskDetails d = prb
@@ -198,7 +192,7 @@ public void testUpdateTaskDetailsChecklist() throws InterruptedException {
         req.addHeader("If-None-Match", d.etag);
         req.patch(details);
 
-        Thread.sleep(4000);
+        Thread.sleep(2000);
         
         PlannerTask updatedTask = prb.tasks(planTask.id).buildRequest().get();
         int checklistItemCount = updatedTask.getRawObject().get("checklistItemCount").getAsInt();
@@ -215,7 +209,6 @@ public void testUpdateTaskDetailsReferences() {
             JsonObject data = new JsonObject();
             PlannerExternalReference reference = new PlannerExternalReference();
 
-            reference.additionalDataManager().put("@odata.type", new JsonPrimitive("microsoft.graph.plannerExternalReference"));
             reference.alias = "Msn";
             reference.previewPriority = " !";
             reference.type = "Other";
@@ -224,7 +217,6 @@ public void testUpdateTaskDetailsReferences() {
             data.add("http%3A//www%2Emsn%2Ecom", referenceJson);
 
             AdditionalDataManager dataManager = details.additionalDataManager();
-            details.oDataType = "#microsoft.graph.plannerTaskDetails";
             dataManager.put("references", data);
 
             PlannerTaskDetails d = prb
@@ -324,7 +316,6 @@ public void testUpdateTaskCategories() {
         data.add("category6", new JsonPrimitive(false));
 
         AdditionalDataManager dataManager = task.additionalDataManager();
-        task.oDataType = "#microsoft.graph.plannerTask";
         dataManager.put("appliedCategories", data);
 
         PlannerTask newTask = prb.tasks(planTask.id).buildRequest().get();
@@ -384,7 +375,6 @@ public void testCreateBucket() {
     public void testUpdateBucket() {
         PlannerBucket patchBucket = new PlannerBucket();
         patchBucket.name = "RenamedBucket";
-        patchBucket.oDataType = "#microsoft.graph.plannerBucket";
 
         IPlannerBucketRequest req = prb.buckets(planBucket.id).buildRequest();
         req.addHeader("If-Match", planBucket.etag);