D4gl - Columns with not null

Hi We're running D4gl 2.02 on NT 4 workstation. We've compiled the programs and forms on SCO Openserver 5.04 and seem to be having the following problem when running the programs. The form has the following type definition f001=tableName.columnName; tableName.columnName is defined on the database as being a NOT NULL column. The input by name statement lets nulls through however. Does anyone know if this is a known bug and if there is a solution for it. We are also using fglschema 2.01.1a, Possibly this is where the problem lies. Thanks in advance Steve Weiss