I was browsing the other day and came across a nice list of commonly used transaction codes for HR.

Master Data
PA10 – Personnel file
PA20 – Display HR Master Data
PA30 – Maintain HR Master Data
PA40 – Personnel Action
PA41 – Change Hiring Data
PA42 – Fast Data Entry for Events
PRMD – Maintain HR Master Data
PRMF – Travel Expenses : Feature TRVFD
PRML – Set Country Grouping via Popup
PRMM – Personnel Events
PRMO – Travel Expenses : Feature TRVCO
PRMP – Travel Expenses : Feature TRVPA
PRMS – Display HR Master Data
PRMT – Update Match code
PS03 – Info type Overview
PS04 – Individual Maintenance of Info types

Time Management
PA51 – Display Time Data
PA53 – Display Time Data
PA61 – Maintain Time Data
PA62 – List Entry of Additional Data
PA63 – Maintain Time Data
PA64 – Calendar Entry
PA70 – Fast Data Entry
PA71 – Fast Entry of Time Data
PBAB – Maintain Vacancy assignments
PT01 – Create Work Schedule
PT02 – Change Work Schedule
PT03 – Display Work Schedule

Payroll
PC00 – Run Payroll
PC10 – Payroll menu USA
PE00 – Starts Transactions PE01 PE02 PE03
PE01 – Schemas
PE02 – Calculation Rules
PE03 – Features
PE04 – Create functions and Operations
PE51 – HR form editor
PRCA – Payroll Calendar
PRCT – Current Settings
PRCU – Printing checks USA
PRD1 – Create DME
SM31 – Maintain Table
SM12 – Locked Secessions
TSTC – Table Look up
SPRO – IMG
SE16 – Data Browser (Table Reports)
PP03 – PD Tables
PPOME – Change Org Unit
PO13 – Maintain Positions
PO03 – Maintain Jobs

Benefits
PA85 – Benefits – Call RPLBEN11
PA86 – Benefits – Call RPLBEN07
PA87 – Benefits – Call RPLBEN09
PA89 – COBRA Administration
PA90 – Benefits Enrollment
PA91 – Benefits – Forms
PA92 – Benefits Tables – Maintain
PA93 – Benefits Tables – Display
PA94 – Benefits – Access Reporting Tree
PA95 – Benefits IMG – Jump to Views
PA96 – Benefits reporting
PA97 – Salary Administration – Matrix
PA98 – Salary Administration
PA99 – Compensation Admin – rel. Changes
PACP – HR-CH : Pension fund, interface

General Reporting
PM00 – Menu for HR Reports
PM01 – Dialogs in HR – Create Custom info types
PRFO – Standard Form
PSVT – Dynamic Tools Menu
PAR1 – Flexible Employee Data
PAR2 – Employee List

Organizational Management
PPOM – Change org Unit
PO03 – Maintain Jobs
P013 – Maintain Position
PO10 – Maintain Organizational Unit
PP01 – Maintain Plan Data (menu-guided)
PP02 – Maintain Plan Data (Open)
PP03 – Maintain Plan Data (Event-guided)
PP05 – Number Ranges
PP06 – Number Ranges Maintenance HR Data
PP07 – Tasks/Descriptions
PP69 – Choose Text for Organizational Unit
PP90 – Setup Organization
PP01 – Change Cost Center Assignment
PP02 – Display Cost Center Assignment
PP03 – Change Reporting Structure
PP04 – Display Reporting Structure
PP05 – Change Object indicators (O/S)
PP06 – Change Object indicators OS
PPOA – Display Menu Interface (with dyn.)
PPOC – Create Organizational Unit
PPOM – Maintain Organizational Plan
PPOS – Display Organizational Plan
PQ01 – Events for Work Center
PQ02 – Events for Training Program
PQ03 – Events for Job
PQ04 – Events for Business Event Type
PQ06 – Local Events
PQ07 – Resource Events
PQ08 – Events for External Person
PQ09 – Events for Business Event Group
PQ10 – Events for Organizational Unit
PQ11 – Events for Qualification
PQ12 – Resource Type Events
PQ13 – Events for Position
PQ14 – Events for Task
PQ15 – Events for Company
PSO5 – PD : Administration Tool
PSOA – Work Center Reporting
PSOC – Job Reporting
PSOG – Org Mgmt General Reporting
PSO1 – Tools Integration PA-PD
PSOO – Organizational Unit Reporting
PSOS – Position Reporting
PSOT – Task Reporting

Recruitment
PB10 – Initial Entry of applicant master data
PB20 – Display applicant master data
PB30 – Maintain applicant master data
PB40 – Applicant events
PB50 – Display applicant actions
PB60 – Maintain Applicant Actions
PB80 – Evaluate Vacancies
PBA0 – Evaluate Advertisements
PBA1 – Applicant Index
PBA2 – List of applications
PBA3 – Applicant vacancy assignment list
PBA4 – Receipt of application

All efforts goes to: http://www.sap-img.com/human/sap-hr-transaction-codes.htm

While this is a pretty large list, it by no means cover all transaction codes available for HCM.

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