diff --git a/addons/account_asset/account_asset.py b/addons/account_asset/account_asset.py
index e008e3d2d26..4118d531cac 100644
--- a/addons/account_asset/account_asset.py
+++ b/addons/account_asset/account_asset.py
@@ -168,8 +168,8 @@ class AccountAssetAsset(models.Model):
                 # depreciation_date = 1st of January of purchase year
                 asset_date = datetime.strptime(self.date[:4] + '-01-01', DF).date()
                 # if we already have some previous validated entries, starting date isn't 1st January but last entry + method period
-                if posted_depreciation_line_ids and posted_depreciation_line_ids[0].depreciation_date:
-                    last_depreciation_date = datetime.strptime(posted_depreciation_line_ids[0].depreciation_date, DF).date()
+                if posted_depreciation_line_ids and posted_depreciation_line_ids[-1].depreciation_date:
+                    last_depreciation_date = datetime.strptime(posted_depreciation_line_ids[-1].depreciation_date, DF).date()
                     depreciation_date = last_depreciation_date + relativedelta(months=+self.method_period)
                 else:
                     depreciation_date = asset_date
@@ -179,6 +179,7 @@ class AccountAssetAsset(models.Model):
             total_days = (year % 4) and 365 or 366
 
             undone_dotation_number = self._compute_board_undone_dotation_nb(depreciation_date, total_days)
+
             for x in range(len(posted_depreciation_line_ids), undone_dotation_number):
                 sequence = x + 1
                 amount = self._compute_board_amount(sequence, residual_amount, amount_to_depr, undone_dotation_number, posted_depreciation_line_ids, total_days, depreciation_date)