When the condition Blank When Zero or Null is true, fill characters are copied into the field. This applies to numeric fields, numeric/text (picture) fields, text fields, and timestamp fields that have a value of zero or no defined value.
No edit pattern processing is performed. Instead, the field is cleared and no formatted data is presented to the user.
When the condition Blank When Zero or Null is false, numeric, text, and date fields display differently.
When the condition is false for numeric and numeric/text (picture) fields, the edit pattern is formatted based on a value of zero. It is the same as if the value is supplied as zero. The standard formatting is applied.
When the condition is false for text fields, the edit pattern is copied into the field as if it is the intermediate result of editing. No formatting is performed. Fill characters are applied after justification.
When the condition is false for date, time, or timestamp fields, the numeric components are edited using a value of zero. Derived components that represent names are ignored as if they are not specified in the edit pattern. These include the month, day, calendar, AM or PM, and time zone names. Derived values that result in numeric values display as zeroes. These include the number of the day or the week. The fill character is applied after justification.
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