Oracle Order Referenceing

For orders for goods and services made in advance (properly!)

AH20151023,A,WhoAskedUs,K#nnnn,Description   The AHyyyymmdd is the date we received the request.

For retrospective order (for all invoices where supplier is open for ordering)

AH20151023,R,WhoAskedUs,K#(if known) otherwise M,Description  WhoAskedUs- name if known, otherwise School acronym