Q: dbload fails on tables starting with underscore "_"

We did not succeed in loading data to an Informix 6.0 table starting with an underscore like "_12ax60_x". Referencing to the syntax, a table name may start with an underscore. Using dbaccess we can create the table and work with it, fill it ... But no way to get dbload to fill it! Any help available?? Thank you, Jens