S IBXDATA=$P($G(IBXSAVE("BILLING PRV",IBXIEN,"C",1,1)),U,2)
FORMAT CODE DESCRIPTION
Always output 4 characters containing the site suffix padded on the left
by 0's if necessary.
Examples: For station# 528, this field is sent as "0000"
For station# 605GC, this field is sent as "00GC"