Input array differences

On our current versioni 6.02 of Informix 4GL within an input array, we have got fields within the form which are defined like columns in a table. some of these are not null fields. On this version when we enter a line of data and press return, the cursor skips to the next line of the array, if at this stage you press accept, the data entered is accepted. After re-compiling the program/forms under the new versioni 7.20UD2 , when you finish entering a line of data in the array and press return, the cursor goes to the next line, and if you press accept, the system message 'this field requires an entered value' is displayed. Are there differences between 6.02 and 7.20UD2, with regards to input array processing, after field , not null fields etc????? Also I've have just seen a warning saying the Y2K compilant version of Online is 7.31? Is this correct? What are the problems with say version 7.30UC2 ? No worries though got another 14 days left.