Working with Customer Equipment Cards 
Customer equipment cards form the database that contains all serial number items that you sold to your customer and for which service can be provided. You can track the history of a specific serial number from the day you sold the item and throughout its entire service period.
The customer equipment card contains information such as:
Location of the item at which you provide service
Service calls related to the item
Service contracts that cover the item
Sales information
Inventory transaction data
You have the following options for creating customer equipment cards:
Enable customer equipment cards to be created automatically for every sold item that is managed by serial numbers.
Specify the item data (serial number data) manually in the Customer Equipment Card window.
Note
If your customer purchased an item, such as equipment, from another source and needs only support or service from your company for this item, no sales transaction takes place in SAP Business One. For this item, you create the customer equipment card manually in the Customer Equipment Card window. You view such items only in the Service module and not in the Inventory module.
To open the Customer Equipment Card window, choose 
Service 
Customer Equipment Card 
.