The history log for a model is limited (about half a year or so). The problem is that you can never say what is the exact reason that you don't get logs: either there were no actions for the requested conditions or they took place so long ago that the logs have already been deleted. Please add the date of the oldest log available in the special History menu for an admin an in the pop up when an end user select history range.
The content in this article has not been evaluated for all Anaplan implementations and may not be recommended for your specific situation.
Please consult your internal administrators prior to applying any of the ideas or steps in this article.