diff --git a/ir/model.py b/ir/model.py
index 2287a4a..54c552c 100755
--- a/ir/model.py
+++ b/ir/model.py
@@ -1606,8 +1606,53 @@ class Log(ResourceAccessMixin, ModelSQL, ModelView):
             return json.dumps(value, sort_keys=True, ensure_ascii=False)
         if value in (None, ''):
             return ''
+        if isinstance(value, str) and re.match(r'^-?\d+(\.\d+)?$', value):
+            value = value.rstrip('0').rstrip('.')
+            return value or '0'
         return str(value)
 
+    @staticmethod
+    def _singular_label(label):
+        if label.endswith('ies'):
+            return label[:-3] + 'y'
+        if label.endswith('s'):
+            return label[:-1]
+        return label
+
+    def _format_nested_change_summary(
+            self, field_label, target_model, old_value, new_value):
+        pool = Pool()
+        Field = pool.get('ir.model.field')
+        lines = []
+        if not isinstance(old_value, dict) or not isinstance(new_value, dict):
+            return lines
+        record_label = self._singular_label(field_label)
+        def record_sort_key(value):
+            try:
+                return int(value)
+            except (TypeError, ValueError):
+                return value
+        for record_id in sorted(
+                set(old_value) | set(new_value), key=record_sort_key):
+            record_old = old_value.get(record_id, {})
+            record_new = new_value.get(record_id, {})
+            if not isinstance(record_old, dict) or not isinstance(
+                    record_new, dict):
+                continue
+            for child_field in sorted(set(record_old) | set(record_new)):
+                child_old = record_old.get(child_field)
+                child_new = record_new.get(child_field)
+                if child_old == child_new:
+                    continue
+                child_label = Field.get_name(target_model, child_field)
+                lines.append('%s %s %s %s => %s' % (
+                        record_label,
+                        record_id,
+                        child_label,
+                        self._format_change_value(child_old),
+                        self._format_change_value(child_new)))
+        return lines
+
     def get_change_summary(self, name):
         if self.event != 'write':
             return ''
@@ -1628,6 +1673,14 @@ class Log(ResourceAccessMixin, ModelSQL, ModelView):
                 field_label = Field.get_name(model, field_name)
             else:
                 field_label = field_name
+            field = getattr(self.resource.__class__, field_name, None)
+            if field and hasattr(field, 'get_target'):
+                target_model = field.get_target().__name__
+                nested_lines = self._format_nested_change_summary(
+                    field_label, target_model, old_value, new_value)
+                if nested_lines:
+                    lines.extend(nested_lines)
+                    continue
             lines.append('%s: %s -> %s' % (
                     field_label,
                     self._format_change_value(old_value),
diff --git a/model/modelstorage.py b/model/modelstorage.py
index 859ce8e..9e72b7c 100755
--- a/model/modelstorage.py
+++ b/model/modelstorage.py
@@ -221,6 +221,72 @@ class ModelStorage(Model):
             }
         return json.dumps(values, sort_keys=True, ensure_ascii=False)
 
+    @staticmethod
+    def _iter_log_commands(value):
+        if not isinstance(value, (list, tuple)):
+            return
+        for item in value:
+            if (isinstance(item, (list, tuple))
+                    and item and isinstance(item[0], str)):
+                command = item[0]
+                if len(item) >= 3:
+                    yield command, item[1], item[2]
+                elif len(item) >= 2:
+                    yield command, item[1], None
+        if value and all(isinstance(item, (list, tuple)) for item in value):
+            return
+        index = 0
+        while index < len(value):
+            command = value[index]
+            if not isinstance(command, str):
+                index += 1
+                continue
+            if command == 'write':
+                if index + 2 >= len(value):
+                    break
+                yield command, value[index + 1], value[index + 2]
+                index += 3
+                continue
+            if index + 1 >= len(value):
+                break
+            yield command, value[index + 1], None
+            index += 2
+
+    @classmethod
+    def _nested_log_values(cls, values):
+        nested_old = {}
+        nested_new = {}
+        for field_name, value in values.items():
+            field = cls._fields.get(field_name)
+            if not field or not hasattr(field, 'get_target'):
+                continue
+            commands = list(cls._iter_log_commands(value) or [])
+            write_commands = [
+                (ids, command_values)
+                for command, ids, command_values in commands
+                if command == 'write' and command_values]
+            if not write_commands:
+                continue
+            Target = field.get_target()
+            field_old = {}
+            field_new = {}
+            for ids, command_values in write_commands:
+                target_ids = [int(i) for i in ids]
+                field_names = list(sorted(command_values.keys()))
+                with without_check_access():
+                    rows = Target.read(target_ids, field_names)
+                for row in rows:
+                    record_id = str(row['id'])
+                    field_old.setdefault(record_id, {}).update({
+                            name: row.get(name)
+                            for name in field_names
+                            })
+                    field_new.setdefault(record_id, {}).update(command_values)
+            if field_old or field_new:
+                nested_old[field_name] = field_old
+                nested_new[field_name] = field_new
+        return nested_old, nested_new
+
     @classmethod
     def create(cls, vlist):
         '''
@@ -304,11 +370,16 @@ class ModelStorage(Model):
                             }
                         for row in cls.read(
                             [r.id for r in records], fields_names)}
+                nested_old, nested_new = cls._nested_log_values(values)
                 for record in records:
+                    record_old_values = old_values.get(record.id, {})
+                    record_new_values = values.copy()
+                    record_old_values.update(nested_old)
+                    record_new_values.update(nested_new)
                     cls.log([record], 'write', ','.join(fields_names),
                         old_values=cls._log_value_text(
-                            old_values.get(record.id, {})),
-                        new_values=cls._log_value_text(values))
+                            record_old_values),
+                        new_values=cls._log_value_text(record_new_values))
 
         ModelAccess.check(cls.__name__, 'write')
         ModelFieldAccess.check(cls.__name__, all_fields, 'write')