The BLANK WHEN ZERO clause causes the blanking of a screen item when
its value is zero.
General Format
Syntax Rules
This clause is allowed only with input, output and update fields
that are numeric or numeric-edited.
General Rules
The BLANK WHEN ZERO clause causes the blanking of a screen item
when its value is zero.
This clause has no effect when the cursor is in the field. That
is, the contents of the field are always displayed, even if zero, if this is
the current input field.