[FIX] account_asset: entries from assets

When an entry is generated from an asset, the number of this entry must be
 the sequence number linked to the journal of the asset and the reference of
 this entry is the name of the asset.

 opw:639760

addons/account_asset/account_asset.py

@@ -406,8 +406,8 @@ class account_asset_depreciation_line(osv.osv):
             context.update({'date': depreciation_date})
             amount = currency_obj.compute(cr, uid, current_currency, company_currency, line.amount, context=context)
             sign = (line.asset_id.category_id.journal_id.type == 'purchase' and 1) or -1
-            asset_name = line.asset_id.name
-            reference = line.name
+            asset_name = "/"
+            reference = line.asset_id.name
             move_vals = {
                 'name': asset_name,
                 'date': depreciation_date,