diff --git a/AstuteSystem/src/main/java/com/astute/dao/SqlDAO.java b/AstuteSystem/src/main/java/com/astute/dao/SqlDAO.java
index 6d07410..e7d922f 100644
--- a/AstuteSystem/src/main/java/com/astute/dao/SqlDAO.java
+++ b/AstuteSystem/src/main/java/com/astute/dao/SqlDAO.java
@@ -464,7 +464,7 @@ public class SqlDAO extends DAO {
     public double getOutstandingBalance(String InvoiceNumber) throws AstuteException {
         double balance;
         try {
-            System.out.println("Calling delete_invoice DB function");
+            System.out.println("Calling get_outstanding_inv_balance DB function");
             CallableStatement stmt = conn.prepareCall("{? = call get_outstanding_inv_balance(?)}");
             stmt.registerOutParameter(1, Types.VARCHAR);
             stmt.setString(2, InvoiceNumber);
@@ -1322,6 +1322,9 @@ public class SqlDAO extends DAO {
             if (paymentAmount > getOutstandingBalance(invoiceNum) ) {
                 throw new AstuteException(DB_ERROR,"Payment amount can't be greater than outstanding balance for Invoice " + invoiceNum);
             }
+            if (paymentAmount <= 0)  {
+                throw new AstuteException(DB_ERROR,"Payment amount must be greater than 0");
+            }
             String dateString = "STR_TO_DATE('" + paymentDate + "', '%Y-%m-%d')";
             String sql = "insert into invoice_payment (inv_no, invoice_payment_type, invoice_amount, payment_date, check_no, transaction_no) values ('" + invoiceNum + "', " + invoicePaymentTypeId + ", " + paymentAmount + ", " + dateString + ", '" + checkNo +"', '" + transactionNo + "')";
             Statement stmt = conn.createStatement();