REQUIRED (EMPTY-CHECK) Phrase
The REQUIRED phrase is used to ensure that a field does not remain empty.
For alphanumeric items, this means that the field must contain at least one character other than a space or a hexadecimal zero. For numeric items, the field must contain a value of other than zero.
If a field remains empty when this phrase is specified, a run-time message will be issued which requires the user to press the reset key and then to re-enter the data.
REQUIRED and EMPTY-CHECK may be used interchangeably.