How to make multi value parameter optional in SSRS

Question

I HAVE REPORT IN SSRS 2005.
I have @strjournal as multi value parameter. Allow blank is checked. Parameter values r assigned through query.
select jornalno,jornalno as descr from tran_table 
union select 'NULL','NULL' 
So for @strjournal,  valuefield = jornalno  , label field = descr
my main query i am giving,
select .... from myTable where  (TRANKEY IN (@strjournal) AND @strjournal<> 'NULL' ) OR (TRANKEY LIKE '%' AND @strjournal = 'NULL')
If i select 'NULL' its giving me correct result (returning all records as condition is like '%')
if i select only 1 journalno (not 'NULL') also giving me correct result (i.e. only 1 record for which jornalno is selected)
if i select more than 1 jornalnos then its giving me error "an expression of non boolean type specified in a context where condition is expected , near ',' "
Any help ??
h2007

Answer 1

I have report in SSRS 2005 with multi value parameter.
@strjournal is multi value parameter. Allow blank is checked. Values r assigned by below query
select journalno,journalno as descr from tranTable
union
select 'NULL','BLANK'
so for @strjournal, value field = journalno and label field = descr
My main query is,
select ---- from mainTable where
(TRANKEY IN (@strjournal) AND @strjournal<> 'NULL' ) OR (TRANKEY LIKE '%' AND @strjournal = 'NULL')
if i select 'NULL' gives me correct result (returns all rows as condition is like '%')
if i select only 1 journalno (not 'NULL') also gives me correct result (returns only 1 record for which journalno is selected)
if i select more than 1 journal nos gives me error, An expression of non-boolean type specified in a
context where a condition is expected, near ',' 
if i select more than 1 values (though i have selected it as multi-value) its giving me error.
if i just give condition, 
select ---- from mainTable where (TRANKEY IN (@strjournal)) 
then i can select multiple
h2007