If you are using HR, and want to assign benefits/deductions using the Class ID method on the Payroll side, then unfortunately we cannot turn off this warning message.
f you are not using HR at this time, then follow the appropriate method below:
Resolution 1: If you are not using HR, click Tools on the Microsoft Dynamics GP menu, point to Setup, point to System, and then click Registration. Scroll down and unmark Human Resources Management.
Resolution 2: If you are not using HR, then go to Add/Remove Programs (or Programs and Features) in the Control Panel, and uninstall Human Resources Management from Microsoft Dynamics GP.