Use pre_init_hook to fill claim number

crm_claim_rma/__init__.py

@@ -26,3 +26,10 @@ from . import wizard
 from . import crm_claim_rma
 from . import account_invoice
 from . import stock
+
+def fill_claim_number(self, cr):
+    cr.execute("""
+        UPDATE "crm_claim" SET "number"=id::varchar
+        WHERE ("number" is NULL)
+           OR ("number" = '/');
+    """)

crm_claim_rma/__openerp__.py

@@ -94,6 +94,7 @@ Contributors:
                'images/return_line.png',
                'images/exchange.png',
                ],
+    'pre_init_hook': 'fill_claim_number',
     'installable': True,
     'auto_install': False,
 }

crm_claim_rma/crm_claim_rma.py

@@ -401,13 +401,6 @@ class ClaimLine(Model):
 class CrmClaim(Model):
     _inherit = 'crm.claim'
 
-    def init(self, cr):
-        cr.execute("""
-            UPDATE "crm_claim" SET "number"=id::varchar
-            WHERE ("number" is NULL)
-               OR ("number" = '/');
-        """)
-
     @api.model
     def _get_sequence_number(self):
         seq_obj = self.env['ir.sequence']