Managing Serial Numbers on Every Transaction 
With this method of serial number management, you create serial numbers every time inventory is received, issued, transferred, or produced. In SAP Business One, this is known as “serial number creation on every transaction”. In this process, you must define serial numbers for items when your company receives them, that is, when you create inventory receipt documents. Similarly, when you issue inventory, you must select serial numbers for the items before you can save the relevant inventory issue documents. Therefore, defining a serial number for the item is mandatory for both inventory receipt documents and inventory issue documents.
Inventory receipt documents are forms used to report the physical movement of items from a location, for example, a warehouse. Inventory receipt documents comprise the following types:
Goods receipt purchase orders
A/R credit memos
A/P invoices
Goods receipts
Receipts from production
Inventory issue documents are forms used to report the physical movement of items from a location, for example, a warehouse. Inventory issue documents comprise the following types:
Goods returns
A/P credit memos
A/R invoices
Deliveries
A/R invoice + payments
Returns
Goods issues
Inventory transfers
Issues for production
The following figure shows the workflow when you create inventory receipt and issue documents for serial number items managed on every transaction:
Procedure
Define general serial number settings for all of the items in inventory. You can define serial number-managed items using this step only, or step 2 only, or both.
For more information, see Defining General Settings for Serial Numbers.
Define serial number settings for specific items. You can define serial number-managed items using this step only, or step 1 only, or both.
For more information, see Defining Serial Number Settings per Item.
Create an inventory receipt document. For more information, see Defining and Selecting Serial Numbers on Every Transaction. When you create an inventory receipt document you can also do the following:
Enter the serial numbers manually or create the serial numbers automatically.
For more information, see Creating Serial Numbers Automatically.
Create serial number strings (this is optional).
For more information, see Creating Strings for Serial Numbers.
After you add the inventory receipt document in SAP Business One, create an inventory issue document.
Select the serial numbers manually or automatically in the inventory issue document.
For more information, see Defining and Selecting Serial Numbers on Every Transaction.