Exposing employee master data from SAP HR system using Web Service

In a general scenario, when you have ICF configured you can expose SAP system business objects and jobs via BAPI. It is very easy to create and expose BAPI as a web service. As there are only few web services for SAP HR module in SAP system however you can transform a BAPI or ABAP function into a web service. If there is no such function you can create one easily.

To find details about BAPI from Function module, use T-Code: SE37 and enter Functional module name for SAP HR module. Below is the list of existing HR function modules in SAP system.

1	HR_ENTRY_DATES	Determine the entry date of an employee
2	HR_PT_HIRE_FIRE	Get Employees Hire date and Exit date
3	CU_READ_RGDIR	Read Payroll cluster Results data for an employee
4	CD_READ_LAST	Get the latest record sequence number in a cluster directory internal table
5	PYXX_READ_PAYROLL_RESULT	Import the Complete Payroll result
6	PYXX_GET_EVALUATION_PERIODS	Import the payroll results generated in a given In-period
7	HRCA_READ_BANK_ADDRESS_2	Read bank name and other details
8	RP_FILL_WAGE_TYPE_TABLE_EXT	Read employees all basic pay details including indirect evaluation.
9	CONVERT_TO_LOCAL_CURRENCY	Convert Foreign currency to Local currency amount
10	HR_GET_TOTAL_AMOUNT_P0008	Get the total amount in Infotype 8 basic pay details.

11	HR_TMW_GET_EMPLOYEE_NAME	Get the employee Name
12	RH_GET_LEADER	Get the Manager
13	HR_GET_PAYROLL_RESULTS	Imports the current payroll results
14	REUSE_ALV_GRID_DISPLAY	Alv Grid type output
15	RH_GET_PERSON_FROM_USER	Get the assignment of the user to a person
16	HR_READ_INFOTYPE	Read the infotype data
17	HR_COUNTRYGROUPING_GET	Get an employee Country grouping details
18	HR_MAINTAIN_MASTERDATA	Update, Insert HR master data.
19	BAPI_EMPLOYEE_ENEQUE	Lock the employee number for maintenance
20	BAPI_EMPLOYEE_DEQUE	Unlock the employee number.

21	HR_INFOTYPE_OPERATION	HR master data maintenance
22	RP_READ_ALL_TIME_ITY	Read Time infotype data.
23	HR_TIME_RESULTS_GET	Read time infotype data
24	RH_READ_INFTY_1000	Returns the relevant records from the Infotype 1000 for OM object types
25	HR_PAD_HIRE_EMPLOYEE	To hire an employee with any infotype data and cost assignment data in the background

You can navigate to module specific Functions in Transaction SE 37 by clicking on SAP Applications.

Select any of the function module and click on Display. You will be navigated to screen with all the details about that BAPI.

Creating Web Service using Function Group:

Run T-code: SE80 -> Enter the Function Group in the Function Group Area

You can also refer to below link for creating and exposing BAPI as Web Service:

https://blogs.sap.com/2006/09/12/creating-and-exposing-bapi-as-web-service-and-using-it-in-web-dynpro/