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Postal Check 
After the address data has been imported to master data object 0ELM_GUID_I, it can be checked for postal errors. The system checks whether the address data is correct, (for example, whether the street exists in the specified city).
The postal check takes place in the SAP CRM system or in a third-party tool.
To be able to perform the postal check, you must have made the necessary Customizing settings in the IMG of the BI system under SAP NetWeaver ® SAP Business Information Warehouse ® General BI Settings ® Customer Relationship Management ® Marketing ® External List Management ® Define Processing for Steps.
In the SAP standard, the postal check is performed in an SAP CRM system.
The address list data is read from master data object 0ELM_GUID_I and transferred by RFC to function module CRM_MKTLIST_POSTAL_CHECK_RFC in the SAP CRM system.
This function module checks the transferred data using API ADDR_REGIONAL_CHECK, which is provided by SAP Business Address Services. In this API, the data is checked using the reference data in the regional structure and, if connected, using third-party software.
For more information on the regional structure, see Customizing in the CRM system.
If you are not using an SAP CRM system to perform a postal check, you can use Business Add-In Define Checks (BW_BELM_CHECK). See Customizing for more information on the BAdI.
To perform the postal check, open an address list using the External List Management interface. Choose Postal Check and enter the start date for the background job.
The data records with incorrect postal data records are marked in the master data object 0ELM_GUID_I. Value 1 is entered in attribute 0ELM_INCADR for this.
The postal check can be repeated. If, for example, after the first check it becomes apparent that the reference data is obsolete and too many data records are marked as having an incorrect address, you can update the reference data and repeat the postal check.