Hi Ravi,
The query may only check the 1st row in the transfer document.
Try:
SELECT distinct 'true' FROM OWTR T0 INNER JOIN WTR1 T1 ON T0.DocEntry = T1.DocEntry WHERE $[OWTR.Filler] = '01' and $[wtr1.whscode] = '02'
UNION ALL
SELECT distinct 'true' FROM OWTR T0 INNER JOIN WTR1 T1 ON T0.DocEntry = T1.DocEntry WHERE $[OWTR.Filler] = '02' and $[wtr1.whscode] = '01'
Thanks,
Gordon