Steve Endow and I have different definitions of “Fun”. Here is one of Steve’s:
Dynamics GP Land: Friday Fun: Dynamics GP lets you delete a Salesperson ID that is assigned to customers, causing eConnect error
Payables & ReceivablesInstall, Upgrade & AdminDevelopment & Integration
Archived post from 2015. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.