>its test!advance

I don't know. Output of gendbc and how you instantiate your grid might help.
Assuming you have indexes on parameter fields directly using the table itself might be a simplier solution (or better person's PKID).
*index on firstname+lastname tag fullname

*Form load
use mytable in 0 again alias grdUpdate order tag fullname

*Grid show point - where you set view params
*Grid.recordsource = 'grdUpdate'
lcFullname = padr(m.FirstName,fsize('FirstName','grdUpdate'))+;
padr(m.LastName,fsize('LastName','grdUpdate'))
set key to lcFullName

Cetin