null in tables

Hi, Does Xnode support null data? I mean, when I did a query that recovers records that contains null data from a MSQL database and I obtained a Tamino query exception

com.softwareag.tamino.db.API.accessor.TQueryException( message: Tamino access failure (8308, INOXIE8308, ), tag: JavaTaminoAPI_4_2_0_60, java: 1.4.2_07, os: Windows XP 5.1 ):
So I’m afraid that X-node has this restriction also.

regards, Ro