How to clean the add-on registration info on server side completely ?

Hi,

I have an issue right now, though i remove all my add-on via SAP B1 Administration add-on menu, i double check no company contains my add-on but still when i use same add-on name with same ver #, then i was told that there was already add-on in the system. My question is how i can remove my previous add-on completely, i am very sure that there is no entry through system add-on manager menu. In my situation, i have several company in one server. I guess when i deploy the add-on into different company with same add-on name and same version #, it caused some conflict and confused the system. So I want to know if there is a way to do complete cleanning.

Thanks!

Lan