SAP HR Transaction Codes
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
PC00_M02_LINF0 – Infotype Overview for Employee
S_AHR_61016380 – Logged Changes in Infotype Data (Important)
S_AHR_61015609 – Bank Details
S_AHR_61015785 – Infotype Overview for Employee

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
SCAL – Manage Hollyday Calendars in TM

PT40 – PDC Error Transaction

PT80 – Subsystem Connection

PT60 – Time Evaluation

PT66 – Display Time Evaluation Results (Cluster B2)
PT_CLSTB2 – Display Time Evaluation Results (Cluster B2) (really important in PT).
PT_CLSTB1 – Display Temporary Time Evaluation Results (Cluster B1)
PT_CLSTL1 – Display Individual Incentive Wages (Cluster L1)
PT_BAL00 – Cumulated Time Evaluation Results (Time Balances/Wage Types)
PT_ERL00 – Time Evaluation Messages: Analysis
PT_QTA10 – Display Absence Quota Information
PT_QTA00 – Generate Absence Quotas

PC00_M05_LWPA-Absence Overview

PC00_M08_OVERVIEW  – Absence data overview

PC00_M43_CPTQ – Ptquoded correction report

Cross Application Time Sheet 
CATS_DA – Display Working Times
CAT2 – Time Sheet: Maintain Times
CAT3 – Time Sheet: Display Times
CATS_APPR_LITE – Approve Working Times
CAT6 – Transfer External -> Time Management

Payroll
PA03 – Payroll Control Record
PU01 – Delete Current Payroll Result
PU03 – Change Payroll Status
PC_PAYRESULT – Display Payroll Results
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
PU95 – is used to  edit wage types groups … in PY

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

PPIS     Human Resources Information System

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