SQL exception in File Adapter.

Hi experts,

I have a sender adapter of type file to retrieve data from ftp conexion. If I use a ftp client I can see remove the files, but when I active the communication channel appears this error in the communication channel monitor:

Error: com.sap.aii.af.ra.ms.api.DeliveryException: Problem inserting 633c24f5-b66e-4216-17b8-b91aa544cfcc(OUTBOUND) into the database: java.sql.SQLException: ORA-01400: no se puede realizar una inserción NULL en ("SAPSR3DB"."XI_AF_MSG"."VERS_NBR")

Any idea?

What is the reason which a sql exception is raised?

Thanks in advance.

Jose Manuel