Hi Eric,
The best way to address it is through Field Status group in the GL Account, but it can have either Order or Cost Center...it will not change dynamically if the order is statistical.
you can write a Substitution at Order Level...stating if AUFK-ASTKZ =X, substitute Cost Center (Constant Value)...so the issue will be addressed at the time of Order Master Creation itself.
Best Regards
Surya