6.1 Error Message during MRP run

I am testing the Forecast and MPS tools in 6.1 and have been running
MRP throughout the day. There are no other users in the system.
After several normal MRP runs, I received the following error:

bfx: Field too large for a data item. Try to incrase -S. (42)

I would click OK and MRP would continue. The first MRP pass where
this happened, I received 10 or so errors. After that, the errors
starter appearing sooner in the MRP run and the frequency jumped
considerably. Initially, the errors started while MRP was processing
stock transfers, but by the last run, they occured while deleting MRP

Any ideas as to what is going on. We have stopped and restarted
database and tried on different machines, but no luck.

Michael Randolph