diff --git a/db/ddlutils/postgresql/functions/C_PaymentTerm_DueDate.sql b/db/ddlutils/postgresql/functions/C_PaymentTerm_DueDate.sql
index 3e6384aaef..ddc956e955 100644
--- a/db/ddlutils/postgresql/functions/C_PaymentTerm_DueDate.sql
+++ b/db/ddlutils/postgresql/functions/C_PaymentTerm_DueDate.sql
@@ -1,4 +1,4 @@
-CREATE OR REPLACE FUNCTION "adempiere"."paymenttermduedate" (in paymentterm_id numeric, in docdate timestamptz) RETURNS timestamptz AS
+CREATE OR REPLACE FUNCTION paymenttermduedate (in paymentterm_id numeric, in docdate timestamptz) RETURNS timestamptz AS
 $BODY$
 /*************************************************************************
  * The contents of this file are subject to the Compiere License.  You may
@@ -32,7 +32,7 @@ BEGIN
 		--	Due 15th of following month
 		IF (p.IsDueFixed = 'Y') THEN		
 			FirstDay := TRUNC(DocDate, 'MM');
-			NoDays := EXTRACT(epoch FROM TRUNC(DocDate) - FirstDay);
+			NoDays := EXTRACT(day FROM TRUNC(DocDate) - FirstDay);
 			DueDate := FirstDay + (p.FixMonthDay-1);	--	starting on 1st
 			DueDate := ADD_MONTHS(DueDate, p.FixMonthOffset);
 			IF (NoDays > p.FixMonthCutoff) THEN
diff --git a/db/ddlutils/postgresql/functions/trunc.sql b/db/ddlutils/postgresql/functions/trunc.sql
index c16adeda01..9771bf7e47 100644
--- a/db/ddlutils/postgresql/functions/trunc.sql
+++ b/db/ddlutils/postgresql/functions/trunc.sql
@@ -20,14 +20,14 @@
 *Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.of
 */
 CREATE OR REPLACE FUNCTION trunc(datetime TIMESTAMP WITH TIME ZONE)
-RETURNS DATE AS $$
+RETURNS TIMESTAMP WITH TIME ZONE AS $$
 BEGIN
 	RETURN CAST(datetime AS DATE);
 END;
 $$ LANGUAGE plpgsql;
 
 CREATE OR REPLACE FUNCTION trunc(datetime TIMESTAMP WITH TIME ZONE, format varchar)
-RETURNS TIMESTAMP WITH TIME ZONE AS $$
+RETURNS DATE AS $$
 BEGIN
 	IF format = 'Q' THEN
 		RETURN CAST(DATE_Trunc('quarter',datetime) as DATE);
@@ -50,4 +50,4 @@ RETURNS INTEGER AS $$
 BEGIN
 	RETURN EXTRACT(DAY FROM i);
 END;
-$$ LANGUAGE plpgsql;
\ No newline at end of file
+$$ LANGUAGE plpgsql;
diff --git a/migration/354a-trunk/oracle/725_BF2819386.sql b/migration/354a-trunk/oracle/725_BF2819386.sql
new file mode 100644
index 0000000000..8d61dca7e9
--- /dev/null
+++ b/migration/354a-trunk/oracle/725_BF2819386.sql
@@ -0,0 +1 @@
+-- just for postgresql
diff --git a/migration/354a-trunk/postgresql/725_BF2819386.sql b/migration/354a-trunk/postgresql/725_BF2819386.sql
new file mode 100644
index 0000000000..ddc956e955
--- /dev/null
+++ b/migration/354a-trunk/postgresql/725_BF2819386.sql
@@ -0,0 +1,49 @@
+CREATE OR REPLACE FUNCTION paymenttermduedate (in paymentterm_id numeric, in docdate timestamptz) RETURNS timestamptz AS
+$BODY$
+/*************************************************************************
+ * The contents of this file are subject to the Compiere License.  You may
+ * obtain a copy of the License at    http://www.compiere.org/license.html
+ * Software is on an  "AS IS" basis,  WITHOUT WARRANTY OF ANY KIND, either
+ * express or implied. See the License for details. Code: Compiere ERP+CRM
+ * Copyright (C) 1999-2001 Jorg Janke, ComPiere, Inc. All Rights Reserved.
+ *
+ * converted to postgreSQL by Karsten Thiemann (Schaeffer AG), 
+ * kthiemann@adempiere.org
+ *************************************************************************
+ * Title:	Get Due timestamp with time zone
+ * Description:
+ *	Returns the due timestamp with time zone
+ * Test:
+ *	select paymenttermDueDate(106, now()) from Test; => now()+30 days
+ ************************************************************************/
+DECLARE
+ 	Days				NUMERIC := 0;
+	DueDate				timestamp with time zone := TRUNC(DocDate);
+	--
+	FirstDay			timestamp with time zone;
+	NoDays				NUMERIC;
+	p   			RECORD;
+BEGIN
+	FOR p IN 
+		SELECT	*
+		FROM	C_PaymentTerm
+		WHERE	C_PaymentTerm_ID = PaymentTerm_ID
+	LOOP	--	for convineance only
+		--	Due 15th of following month
+		IF (p.IsDueFixed = 'Y') THEN		
+			FirstDay := TRUNC(DocDate, 'MM');
+			NoDays := EXTRACT(day FROM TRUNC(DocDate) - FirstDay);
+			DueDate := FirstDay + (p.FixMonthDay-1);	--	starting on 1st
+			DueDate := ADD_MONTHS(DueDate, p.FixMonthOffset);
+			IF (NoDays > p.FixMonthCutoff) THEN
+				DueDate := ADD_MONTHS(DueDate, 1);
+			END IF;
+		ELSE
+			DueDate := TRUNC(DocDate) + p.NetDays;
+		END IF;
+	END LOOP;
+	RETURN DueDate;
+END;
+$BODY$
+LANGUAGE 'plpgsql'
+;