The BLANK WHEN ZERO clause specifies that an item contains nothing but spaces when its value is zero.
BLANK WHEN ZERO Clause - Format >>-BLANK--+------+--ZERO--------------------------------------->< '-WHEN-'
The BLANK WHEN ZERO clause may be specified only for elementary numeric or numeric-edited items. These items must be described, either implicitly or explicitly, as USAGE IS DISPLAY. When the BLANK WHEN ZERO clause is specified for a numeric item, the item is considered a numeric-edited item.
The BLANK WHEN ZERO clause must not be specified for level-66 or level-88 items.
The BLANK WHEN ZERO clause must not be specified for an entry containing the PICTURE symbols S or *.