Error "Enter Special Stock"

Hi,

I am using BOM items in consignment issue sales order.

When I try to PGI the corresponding delivery i get error message "Enter Special stock ".

Message no M7018.

There are sufficint stock under consignment stock and special stocking partner SB also exits in sales order.

I do not get this error when I PGI consignment issue delivery for normal items.

Kindly suggest how to resolve the same.