Doubt in Alrtcatdef

Hi

I want to trigger alert whenever user creating sales order in va02. I have already configured in alrtcatdef in wht i configured category and classification. In container tab i configured sales order Business object.

In long and short text tab, i configured n long text like

This is Sales order no : &SALES.SALESDOCUMENT&

After that i assigned swe2 in that i mentioned event - create, bo.

When i'm creating sales order alert has triggered. but values not passed i.e &SALES.SALESDOCUMENT&

How can i assign?