Power Builder - Adding Table for ASA Database

//===adding table for ASA database=======
select count(*) into :li_table from systable where table_name = upper('saldo_rekmtr');

if li_table = 0 then
ls_add = 'CREATE TABLE "dba"."saldo_rekmtr" ' +&
'("kd_unit" char(5) NOT NULL DEFAULT NULL,' +&
'"rek" varchar(9) NOT NULL DEFAULT NULL, ' +&
'PRIMARY KEY ("kd_unit"")) ;'
execute immediate :ls_add;
ls_idx = 'CREATE UNIQUE INDEX "idx_saldorekmtr" ON "dba"."saldo_rekmtr" ' +&
'("kd_unit") ;'
execute immediate :ls_idx;
end if