turn on the prompt for specail order priority?

looking to find the hook / switch that would turn on a prompted "special order priority?" when ordering a part. I've got the priorities all defined inside UOP. i just cant find the spot to tell Invoicing & PRO to prompt for SOP priority. my previous store would prompt with default priority filled in.
CDJR dealership.
Default Priority: D
PRIORITY DESCRIPTION
D DAILY
E EVERYDAY - LOWEST PRIORITY
S SPECIAL - "LOWGRADE"
Z SPECIAL - NO DSS
everything fills the D bucket because that's default. how can say "hey order this part with S1 priority"
previous store would prompt for SOP Priority and Tech number on after the enter on O to order.
Someone suggested it may be able to be done as an override? (1 S=123 O=Z ) but that doesn't seem to take. PART NO. 5182390AB Quantity 1 P=Z INVALID OVERRIDE, PRICES MUST BE NUMERIC
appreciate any insight or if you are CDJ what works for you?
CDJR dealership.
Default Priority: D
PRIORITY DESCRIPTION
D DAILY
E EVERYDAY - LOWEST PRIORITY
S SPECIAL - "LOWGRADE"
Z SPECIAL - NO DSS
everything fills the D bucket because that's default. how can say "hey order this part with S1 priority"
previous store would prompt for SOP Priority and Tech number on after the enter on O to order.
Someone suggested it may be able to be done as an override? (1 S=123 O=Z ) but that doesn't seem to take. PART NO. 5182390AB Quantity 1 P=Z INVALID OVERRIDE, PRICES MUST BE NUMERIC
appreciate any insight or if you are CDJ what works for you?