generally Garnishments is used in USA and some of the countries using are Germany , Sweden , chile , france ,
Garnishment Chile (3235) Infotype - Net Part of Payroll - SAP Library
Garnishments (PY-CA-NT-GR) - Payroll Canada (PY-CA) - SAP Library
Garnishment (Infotype 0426) - Mexican payroll schema - SAP Library
Wage and Salary Garnishments - Payroll Austria (PY-AT) - SAP Library
refer below for the process :-
http://wiki.scn.sap.com/wiki/display/ERPHCM/Garnishment+FAQ
The Garnishment Process - Payroll United States (PY-US) - SAP Library