# Cancel A Cancel System Script runs whenever a Keyfax script is cancelled. When a Keyfax script is cancelled no history is captured for the script so it's not possible to provide detailed reporting within Keyfax around script cancellations. If a script is cancelled Keyfax would typically pass back a flag to your housing management system or tenant portal to indicate the script was cancelled and no action is required. We recommend adding a Message to the script to inform the user that Keyfax is about to cancel and advise on next steps to make for a better user experience. {% hint style="info" %} **Note:** Reserved System Scripts cannot link to Master Scripts. You can only link to Custom System Scripts. {% endhint %}