Deleting a Warehouse

Dear experts ,

Trying to delete a warehouse following instructions in this link

Removing Warehouses - SAP Business One 9.0 - SAP Library

I'm getting an error message :

Cannot remove warehouse; this warehouse is defined as the default warehouse for one or more items   [Message 665-10]

but running a query against OITM with default warehouse fields has no records listed for this warehouse as default warehouse

also , this is not a company default warehouse (e.g. warehouse 01)

Thanks ,

Nadav.