Restriction for users

Hi All,

We have one add-on. In that we created 4 document series as group wise. There are 4 users which they are having each individual numbering series.

Normally i used to restrict users in SAP documents like PO and SO by authorizations in Administration module.

Administration-->System initialization--> Authorizations--->General authorizations-->>

after selecting user..

Administration-->System initialization--> Numbering series-->group wise restriction.

But it is not working in Add-on.

Now how can i restrict other users for not viewing and adding documents in others document series.?

Any other option?

Thanks & Regards,

Sai