Sybase ASE BCP In With Table with No Identity Column

Here's a fun one. I wanted to test some edge case stuff like tables that are not properly defined. When I have a bcp in for a table that has no IDENTITY column, I get an error. Here's the whole flow of things:

My table is defined like this:

CREATE TABLE [dbo].[XTABLE] (
            [BOGUSID] INT NOT NULL ,
            [DAT] DATETIME NOT NULL
)

No pk/identity.

I export its data (few rows ) in bcp with this:

bcp mytester.dbo.XTABLE out XTABLE.bcp -U sa -P mypass -T -n

now, I want to bring it back in using this:

bcp mytester.dbo.XTABLE in MyTable.bcp  -E -n -S Sybase_157 -U sa -P SyAdmin

The result says:

Server Message: Sybase157 - Msg 7756, Level 16, State 1:

Cannot use 'SET IDENTITY_INSERT' for table 'mytester.dbo.XTABLE' because the table does not have the identity property.

I have looked over the bcp page, but can't come up with some way to tell it it's ok to insert without identity column...

Any suggestions experts?