0021610: Wrong Outstanding Amount adding Payment to Invoice

diff --git a/modules/org.openbravo.advpaymentmngt/src/org/openbravo/advpaymentmngt/event/FIN_PaymentEventListener.java b/modules/org.openbravo.advpaymentmngt/src/org/openbravo/advpaymentmngt/event/FIN_PaymentEventListener.java
new file mode 100644
--- /dev/null
+++ b/modules/org.openbravo.advpaymentmngt/src/org/openbravo/advpaymentmngt/event/FIN_PaymentEventListener.java
@@ -0,0 +1,60 @@
+/*
+ *************************************************************************
+ * The contents of this file are subject to the Openbravo  Public  License
+ * Version  1.0  (the  "License"),  being   the  Mozilla   Public  License
+ * Version 1.1  with a permitted attribution clause; you may not  use this
+ * file except in compliance with the License. You  may  obtain  a copy of
+ * the License at http://www.openbravo.com/legal/license.html
+ * Software distributed under the License  is  distributed  on  an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
+ * License for the specific  language  governing  rights  and  limitations
+ * under the License.
+ * The Original Code is Openbravo ERP.
+ * The Initial Developer of the Original Code is Openbravo SLU
+ * All portions are Copyright (C) 2012 Openbravo SLU
+ * All Rights Reserved.
+ * Contributor(s):  ______________________________________.
+ *************************************************************************
+ */
+package org.openbravo.advpaymentmngt.event;
+
+import java.util.List;
+
+import javax.enterprise.event.Observes;
+
+import org.openbravo.base.exception.OBException;
+import org.openbravo.base.model.Entity;
+import org.openbravo.base.model.ModelProvider;
+import org.openbravo.client.kernel.event.EntityDeleteEvent;
+import org.openbravo.client.kernel.event.EntityPersistenceEventObserver;
+import org.openbravo.dal.core.OBContext;
+import org.openbravo.dal.service.OBDal;
+import org.openbravo.database.ConnectionProvider;
+import org.openbravo.erpCommon.utility.Utility;
+import org.openbravo.model.financialmgmt.payment.FIN_Payment;
+import org.openbravo.model.financialmgmt.payment.FIN_PaymentDetail;
+import org.openbravo.service.db.DalConnectionProvider;
+
+public class FIN_PaymentEventListener extends EntityPersistenceEventObserver {
+  private static Entity[] entities = { ModelProvider.getInstance().getEntity(
+      FIN_Payment.ENTITY_NAME) };
+
+  @Override
+  protected Entity[] getObservedEntities() {
+    return entities;
+  }
+
+  public void onDelete(@Observes
+  EntityDeleteEvent event) {
+    if (!isValidEvent(event)) {
+      return;
+    }
+    FIN_Payment pay = OBDal.getInstance().get(FIN_Payment.class, event.getTargetInstance().getId());
+    List<FIN_PaymentDetail> pdList = pay.getFINPaymentDetailList();
+    if (pdList.size() > 0) {
+      String language = OBContext.getOBContext().getLanguage().getLanguage();
+      ConnectionProvider conn = new DalConnectionProvider(false);
+      throw new OBException(Utility.messageBD(conn, "APRM_PaymentCanNotBeDeleted", language));
+    }
+  }
+}