Reflects type of manual modification performed in IAR:
P - Pricing field change
Bank Rate
Calculated Fare
Calculated Fare - ISO Currency
Class Code - Conjunction
Class of Service
Date of Issue
Fare Basis
Fare Basis - Conjunction
Form of Payment Account Number
Form of Payment Acct Num - EX
Manual Equivalent Fare - ISO
PFC Amount
PFC Location
PFC Total
PTA Service Charge
Tax Amount
Tax Type
Ticket Designator
Total Document Amount
Tour
N - Non-pricing field change