There is no standard practice, because every company is different and there numbering needs are therefore different. For example, an Oil & Gas company operating only 1 field in only 1 country may number their documents ORIGINATING COMPANY-DISCIPLINE-DOCUMENT TYPE-SEQUENTIAL NUMBER. However, and Oil & Gas company operating 300 fields in 20 countries may number their documents COUNTRY-FIELD-ORIGINATING COMPANY-DISCIPLINE-DOCUMENT TYPE-SEQUENTIAL NUMBER. The culture and the needs of each company determines the way they number documents.
