That merely indicates that the name of an undef column or parameter was found. The error message that DB2 displays should indicate what it might be:
DB2 SQL Error: SQLCODE=-206, SQLSTATE=42703, SQLERRMC=[THE_UNDEFINED_COLUMN_OR_PARAMETER_NAME], DRIVER=4.8.87
Verify your table definition once again. Perhaps you simply forgot to add something.
I hope this helps you.