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Serial Number Download 
Serial number download functionality allows you to replicate pure serial numbers (serial numbers that are not associated with equipment) along with their associated business partners and configuration from SAP R/3 into mySAP CRM as individual objects.
Having serial numbers as individual objects in mySAP CRM allows you to take advantage of the individual object's functionalities in mySAP CRM.
General serial number information like R/3 material number, R/3 equipment category, and so on, are stored in the standard SAP delivered set type COM_TA_R3_ID.
To download serial numbers and their associated business partners, you must use adapter object SERIALNUMBER.
To download the configuration of serial numbers, you must use adapter object SERNR_CONFIG.