diff --git a/src/db/migration/V20170911_1505__mantis9798.sql b/src/db/migration/V20170911_1505__mantis9798.sql
new file mode 100644
index 000000000..a6646c149
--- /dev/null
+++ b/src/db/migration/V20170911_1505__mantis9798.sql
@@ -0,0 +1,15 @@
+--drop constraint se existe
+DECLARE
+itemExists NUMBER;
+BEGIN
+     itemExists := 0;
+
+SELECT COUNT(CONSTRAINT_NAME) INTO itemExists 
+FROM ALL_CONSTRAINTS
+WHERE UPPER(CONSTRAINT_NAME) = UPPER('PRECIO_VENTAJA__UN');
+
+IF itemExists > 0 THEN
+EXECUTE IMMEDIATE 'ALTER TABLE PRECIO_VENTAJA DROP CONSTRAINT PRECIO_VENTAJA__UN';
+END IF;
+
+END;
\ No newline at end of file