[FIX] if an old cooperator subscribe again to some share, he should not

receive a new cooperator number

easy_my_coop/models/account_invoice.py

@@ -23,10 +23,10 @@ class account_invoice(models.Model):
         mail_template_name = 'Payment Received Confirmation - Send By Email'
         
         # if not yet cooperator we generate a cooperator number
-        if self.partner_id.member == False :
+        if self.partner_id.member == False and self.partner_id.old_number == False:
             sequence_id = obj_sequence.search([('name','=','Subscription Register')])[0]
             sub_reg_num = sequence_id.next_by_id()
-            self.partner_id.write({'member':True,
+            self.partner_id.write({'member':True,'old_member':False,
                                    'cooperator_register_number':int(sub_reg_num)})
         else:
             mail_template_name = 'Share Increase - Payment Received Confirmation - Send By Email'