Base.HSQL: Reference, Call Identity

hi,
   Have a DB 1:n, n:0|1, 0|1:1 and some ro-tables feeding listboxes, 
all together driven by BASIC and DIALOG (was not able to create a 
understandable, simple GUI using FORMs and REPORTs).

During inserting a new record 'n' one must supply the reference to 
the higher record '1'. My clumsy method is:
'getREF SID (the higher level):
   s_SQL(16)="SELECT SID FROM "+sJS+  " ORDER BY SID DESC"
   oReSe      =oStmt.executeQuery(s_SQL(16))
   oReSe.next()
   SID          =oReSe.getInt(1)

The (H)SQL-Syntax knows the function 'CALL IDENTITY()'
but
how can I use it?

oStmt.executeUpdate(...)  goes on strike...

Any solution?

Kind regards
Wolfgang