Perhaps this intends to sum all VATs considering all TICKETs excluding null. However, Sum({$<TICKET={ '*' } >} VAT) itself should give the same output, because '*' itself doesn't include null. If your TICKET field has some values which are not really null but blank, it might give a different output (which is possibly expected) I presume.
Perhaps this intends to sum all VATs considering all TICKETs excluding null. However, Sum({$<TICKET={ '*' } >} VAT) itself should give the same output, because '*' itself doesn't include null. If your TICKET field has some values which are not really null but blank, it might give a different output (which is possibly expected) I presume.
