1000's syntax (variable) > item
For integer numbers with a variable thousands separator, the Separator property is Yes, and the 1000's Syntax is Variable, you can specify an item type for the variable thousands separator.
You can select the desired syntax item from the drop-down list. Or, with the focus on the Item property (in the Value column), press Alt and drag the default separator type item from the schema editor into the Value column.
An item type with a class of Syntax must exist in the schema to be a valid 1000's Syntax Item.