Item with Zero Weight

To All,

Can some one correct the give query which is for "Item with zero weight" Alert.

Query

SELECT

distinct p.organization_code ,

substr(i.segment1,1,20) ,

substr(i.description,1,50),

i.creation_date,

INTO

&org

, &item

, &descr

, &create_date

FROM

mtl_system_items i,

mtl_parameters p

where i.organization_id = p.organization_id

and p.organization_code in ('INF','ENF')

and i.INVENTORY_ITEM_STATUS_CODE||'' = 'Active'

and i.unit_weight is null

and I.ITEM_TYPE = 'P'

order by 1,2

Regards,

Farhaj Ahmed Khan