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You might be able to do it that way. I haven’t used any of the BO Attachment methods before. If you use that, you’ll probably also need to call the Update or UpdateExt using the return dataset from that method, which will actually save the changes you made with GetNewShipHeadAttch to the database.
It looks like the user in this thread used the Ice.BO.AttachmentSvc // UploadFile() method with some success, so you might check that out as well.