I built a custom module called AIT Staff, and created a lookup field in the Accounts module that referred to a field in the custom created one.  I decided to change the approach I was going to use and deleted the lookup field from the Accounts module, and tried to delete the custom module I had created, but can't because it says:  'AIT Staff' cannot be deleted as it is not an independent module.  The following lookup relationship with 'AIT Staff' must first be deleted before deleting the module.

I can't find this lookup relationship anywhere.  Is there something I'm missing?