字段帮助 (DACORD1)
Flag used to specify whether this element can be used as order footer. This flag only takes the value Yes if the previous Order line field is positioned to No: in effect, an element cannot be used both at line level and at order footer or invoice level. Warning: An element declared to be 'present in the order footer' is indeed only managed at order level if it belongs to the list of the invoice elements declared in the supplier record.