diff --git a/doc/migrate/4.0.0-4.2.0/pre-tiny.py b/doc/migrate/4.0.0-4.2.0/pre-tiny.py
index fce160ef4d2..0cd37882df3 100644
--- a/doc/migrate/4.0.0-4.2.0/pre-tiny.py
+++ b/doc/migrate/4.0.0-4.2.0/pre-tiny.py
@@ -73,6 +73,23 @@ password = hasattr(options, 'db_password') and "password=%s" % options.db_passwo
 db = psycopg.connect('%s %s %s %s %s' % (host, port, name, user, password), serialize=0)
 cr = db.cursor()
 
+# ------------------------ #
+# change currency rounding #
+# ------------------------ #
+
+cr.execute("""SELECT c.relname,a.attname,a.attlen,a.atttypmod,a.attnotnull,a.atthasdef,t.typname,CASE WHEN a.attlen=-1 THEN a.atttypmod-4 ELSE a.attlen END as size FROM pg_class c,pg_attribute a,pg_type t WHERE c.relname='res_currency' AND a.attname='rounding' AND c.oid=a.attrelid AND a.atttypid=t.oid""")
+res = cr.dictfetchall()
+if res[0]['typname'] != 'numeric':
+	for line in (
+		"ALTER TABLE res_currency RENAME rounding TO rounding_bak",
+		"ALTER TABLE res_currency ADD rounding NUMERIC(12,6)",
+		"UPDATE res_currency SET rounding = power(10, - rounding_bak)",
+		"ALTER TABLE res_currency DROP rounding_bak",
+		):
+		cr.execute(line)
+cr.commit()
+
+
 # fix country
 
 
diff --git a/doc/migrate/4.0.0-4.2.0/pre.py b/doc/migrate/4.0.0-4.2.0/pre.py
index 24c38284b94..3eaf5465e35 100644
--- a/doc/migrate/4.0.0-4.2.0/pre.py
+++ b/doc/migrate/4.0.0-4.2.0/pre.py
@@ -73,22 +73,6 @@ password = hasattr(options, 'db_password') and "password=%s" % options.db_passwo
 db = psycopg.connect('%s %s %s %s %s' % (host, port, name, user, password), serialize=0)
 cr = db.cursor()
 
-# ------------------------ #
-# change currency rounding #
-# ------------------------ #
-
-cr.execute("""SELECT c.relname,a.attname,a.attlen,a.atttypmod,a.attnotnull,a.atthasdef,t.typname,CASE WHEN a.attlen=-1 THEN a.atttypmod-4 ELSE a.attlen END as size FROM pg_class c,pg_attribute a,pg_type t WHERE c.relname='res_currency' AND a.attname='rounding' AND c.oid=a.attrelid AND a.atttypid=t.oid""")
-res = cr.dictfetchall()
-if res[0]['typname'] != 'numeric':
-	for line in (
-		"ALTER TABLE res_currency RENAME rounding TO rounding_bak",
-		"ALTER TABLE res_currency ADD rounding NUMERIC(12,6)",
-		"UPDATE res_currency SET rounding = power(10, - rounding_bak)",
-		"ALTER TABLE res_currency DROP rounding_bak",
-		):
-		cr.execute(line)
-cr.commit()
-
 # ----------------------------- #
 # drop constraint on ir_ui_view #
 # ----------------------------- #