Hi Borislav,

This is a bug in the way VFPOLEDB handles binary parameters. The problem can be avoided by specifying custom update command as follows:

oCA.UpdateCmdDataSourceType="ADO"
oCA.UpdateCmdDataSource=createobject('ADODB.Command')
oca.UpdateCmdDataSource.ActiveConnection = loConnDataSource
oCA.UpdateCmd="UPDATE test SET testval=?catest.TESTVAL WHERE testval=?OLDVAL('TESTVAL','catest')"

Thanks,
Aleksey.