jeffrey engberg May 12, 2016:

Best.nr. Order number The term is used to designate official govt (framework) documents:
see Arbeidstilsynet: http://www.arbeidstilsynet.no/binfil/download2.php?tid=77838
I use Order.no., always capitalized.
https://www.regjeringen.no/no/dokumenter/svangerskapspenger/...

Per Bergvall May 11, 2016:

Both are probably valid terms... It is conceivable that bestillingsnummer refers to a master booking, general agreement, frame agreement or similar, while ordrenummer refers to a single order for a specific item or number of items with a common delivery date and location. The latter would often be called 'avrop' in cases where a main office makes the agreement and branch offices places their orders. The precise terms are not essential here - just keeping them distinct and not confused. Booking number and order number would be a place to start.

Leif Henriksen May 11, 2016:

A wild guess could be that "Ordrenr" is the production order no., and the "Bestillingsnr." could be the procurement no., but this is not clear in any way. I would recommend asking the customer.