You develop a synchronous plug-in registered on the Update message of the Account table. Within the plug-in, business logic updates the same account record's credit limit field, which can in turn re-trigger the plug-in. Users report a 'This workflow job was canceled because the workflow that started it included an infinite loop' style error, and updates sometimes fail. You must prevent the plug-in from recursively re-invoking itself while still allowing legitimate updates from users. What should you do in the plug-in code?