We ran across this issue with Data Services which required us to patch to DS 4.2 SP3. I suspect there is a corresponding patch in Business Objects. Sorry, I don't have the CR number. I've asked for it but haven't received any real info on it.
"Your error appears to be a known bug that occurs with Sybase 16.8 with
Bulk loading. At this time this issue has been fixed in DS 4.2 SP3"