- Fixed upgrade error

sql/postgresql/upgrade/upgrade-5.0.3.0.2-5.0.3.0.3.sql

+-- 5.0.3.0.2-5.0.3.0.3.sql
+SELECT acs_log__debug('/packages/intranet-timesheet2-tasks/sql/postgresql/upgrade/upgrade-5.0.3.0.2-5.0.3.0.3.sql','');
+
+
+
+-- Add difference_format_id to im_timesheet_task_dependencies
+--
+create or replace function inline_0 () 
+returns integer as $body$
+DECLARE
+	v_count			integer;
+BEGIN
+	-- Check if colum exists in the database
+	select	count(*) into v_count from user_tab_columns 
+	where lower(table_name) = 'im_timesheet_task_dependencies' and lower(column_name) = 'difference_format_id';
+	IF v_count > 0  THEN return 1; END IF; 
+
+	alter table im_timesheet_task_dependencies add difference_format_id integer
+		constraint im_timesheet_task_dep_diff_format_fk references im_categories;    
+
+	return 0;
+END;$body$ language 'plpgsql';
+SELECT inline_0 ();
+DROP FUNCTION inline_0 ();
+
+