As noted with the configuration variable A4GL_MAX_DATE, invalid dates can be incorrectly written to the database. Invalid dates are written as NULL, but if the date is in the key, problems can occur. To avoid invalid date problems in this instance, use the A4GL_MIN_DATE configuration variable to set the low-value date.
The format is
A4GL_MIN_DATE = YYYYMMDD
The default date for A4GL_MIN_DATE is "19000101" (January 1, 1900).