Managing Batch Numbers on Release Only 
With this method of batch number management, you create and select batch numbers whenever inventory is released, that is, issued externally or internally. In SAP Business One, this is known as “batch number creation on release only”. When you issue inventory, you must create and/or select the relevant batch numbers, before you can save the relevant inventory issue documents. Therefore, defining a batch number for the item is mandatory for every inventory issue document. It is optional for other transactions such as inventory receipt documents.
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 issue documents for batch number items managed on release only:
Procedure
Define general batch number settings for the items.
For more information, see Defining General Settings for Batch Numbers.
Create an inventory issue document.
Create the batch numbers for the items (the batch numbers were not created automatically for the items on receipt).
For more information, see Completing Batch Numbers on Issue. You can create the batch numbers in the following ways:
Enter the batch numbers manually or create the batch numbers automatically
For more information, see Creating Batch Numbers Automatically.
Create batch number strings (this is optional)
For more information, see Creating Strings for Batches.
Select the batch numbers manually or automatically in the document.
For more information, see Defining and Selecting Batches on Release Only.