A subscripted column in a check constraint has subscripts outside the bounds of the column. Check that the bounds specified in the subscripted column do not exceed the maximum length of the column. If you know the table name of the column, use the following subquery to query the system-catalog tables to find out the maximum length of the column:
SELECT collength FROM syscolumns WHERE colname = 'column-name' AND tabid = (SELECT tabid FROM systables WHERE tabname = 'table-name')