diff --git a/AstuteSystem/src/main/java/com/astute/dao/DAO.java b/AstuteSystem/src/main/java/com/astute/dao/DAO.java
index 668e193..e095354 100644
--- a/AstuteSystem/src/main/java/com/astute/dao/DAO.java
+++ b/AstuteSystem/src/main/java/com/astute/dao/DAO.java
@@ -121,6 +121,9 @@ public abstract class DAO {
 
     public abstract GeneratedInvoice getGeneratedInvoice(String invoiceNumber)throws AstuteException;
 
+    public abstract void submitInvoice(String InvoiceNumber) throws AstuteException;
+
+    public abstract void voidInvoice(String InvoiceNumber) throws AstuteException;
 
     public abstract List<Customer> getCustomers(int customerId) throws AstuteException;
 
diff --git a/AstuteSystem/src/main/java/com/astute/dao/SqlDAO.java b/AstuteSystem/src/main/java/com/astute/dao/SqlDAO.java
index 212bde8..8eb127e 100644
--- a/AstuteSystem/src/main/java/com/astute/dao/SqlDAO.java
+++ b/AstuteSystem/src/main/java/com/astute/dao/SqlDAO.java
@@ -119,7 +119,7 @@ public class SqlDAO extends DAO {
             }
 
 //            if (contractNum != null && !contractNum.isEmpty()) {
-                updateClause = updateClause + " contract_num = '" + contractNum.toUpperCase() + "',";
+                updateClause = updateClause + " contract_num = '" + contractNum + "',";
 //            }
 //            if (PODate != null) {
                 updateClause = updateClause + " PO_Date = STR_TO_DATE(" + PODate + ", '%Y-%m-%d')" + ",";
@@ -494,6 +494,35 @@ public class SqlDAO extends DAO {
     }
    }
 
+    public void submitInvoice(String InvoiceNumber) throws AstuteException {
+        try {
+            if (InvoiceNumber == null || InvoiceNumber.isEmpty()) {
+                throw new AstuteException(0, "Invoice Number should not be null!");
+            } else {
+                String sql = "UPDATE INVOICE SET INV_STATUS = 2 WHERE UPPER(INV_NO) =  'UPPER(" + InvoiceNumber + ")'";
+                Statement stmt = conn.createStatement();
+                stmt.executeUpdate(sql);
+            }
+        } catch(SQLException e){
+                e.printStackTrace();
+                throw new AstuteException(DB_ERROR, e.getMessage());
+            }
+        }
+
+    public void voidInvoice(String InvoiceNumber) throws AstuteException {
+        try {
+            if (InvoiceNumber == null || InvoiceNumber.isEmpty()) {
+                throw new AstuteException(0, "Invoice Number should not be null!");
+            } else {
+                String sql = "UPDATE INVOICE SET INV_STATUS = 3 WHERE UPPER(INV_NO) =  'UPPER(" + InvoiceNumber + ")'";
+                Statement stmt = conn.createStatement();
+                stmt.executeUpdate(sql);
+            }
+        } catch(SQLException e){
+            e.printStackTrace();
+            throw new AstuteException(DB_ERROR, e.getMessage());
+        }
+    }
    /*
 =============================== Customer Methods ===============================================
  */