Global Address Cleanse Transform Tutorial:
http://wiki.scn.sap.com/wiki/display/EIM/Global+Address+Cleanse+Transform
Beginners can use the Data QUality Blueprints that are provided by SAP on the SCN:
Data Services Blueprints - http://scn.sap.com/docs/DOC-8820
Also recommended looking at YouTube, where you can find videos provided by SAP Academy or SAP D&T Academy that also talk about Data Services Jobs and usage of data quality transforms:
E.g. for Data Cleanse: http://www.youtube.com/watch?v=EhM1r2VLryA
when you want to
After installing your Address Directory, you have to create a batch or real-time job in DS Designer that reads source data, processes the data with the Global Address Cleanse transform and writes the results to a target. You have to map the fields from the source to the input of your GAC transform (different address formats supported (multiline, hybrid, discrete) depends on what format your input has), do not forget to set the right options and parameters in the GAC transform e.g. your output standard.
Global Address Cleanse transform uses either the All World Address Directory or if installed the Address Directory Belgium (more detailled, more expensive).
OR load the BluePrint and adapt it for Belgium.
Niels
nweigel 
(BOB member since 2008-11-05)