Rec.Insert/Modify/Delete doesn't trigger Change Log?

In the form, user will enter some value then program will process it, and enter them through C/AL code command.

recBrand.INIT;
recBrand.Name:='Navision';
recBrand.INSERT(TRUE);

Conditions
1.) I'm using the standard feature of Change Log.
2.) The form itself has already link to another SourceTable.
3.) I have setup the Change Log few days ago, and have restart my notebook for many times. The setting is All Fields.
4.) When I open the table, and enter value straight away, it trigger the change log.

Questions
1.) Why it cannot trigger the Change Log? Is it a bug?

2.) How can I make my code to trigger the Change Log?


Thanks in Advance.