||Amount of prior standard basic pay supplement that is designed to be the sole or primary prior basic pay supplement for employees within a pay system or subsystem. The supplement is a regular, fixed payment for nonovertime hours that is creditable as prior basic pay for retirement purposes, excluding any type of premium payment or differential that is triggered for working certain hours of the day or week or for performing certain types of work. Includes GS prior locality pay, prior title 38 market pay, or similar prior supplements. Excludes prior GS special rate supplement and similar prior secondary supplements. Express amount using same prior pay basis as used for prior basic pay rate.