The BLANK WHEN ZERO clause specifies that an item contains only spaces when its value is zero.
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The BLANK WHEN ZERO clause may be specified only for an elementary item described by its picture character string as category numeric-edited or numeric, without the picture symbol S or *. These items must be described, either implicitly or explicitly, as USAGE DISPLAY or USAGE NATIONAL.
A BLANK WHEN ZERO clause that is specified for an item defined as numeric by it picture character string defines the item as category numeric-edited.
The BLANK WHEN ZERO clause must not be specified for date fields.