Sales - A/R 
This module covers the entire sales process, from creating quotations for customers and interested parties, to invoicing, creating document drafts, and printing. SAP Business One provides an extensive range of sales documents, each of which pertains to a different stage of the sales process.
You can customize documents to meet special requirements, as follows:
Combine different types of content in one sales document by making appropriate settings in the Form Settings window.
Perform batch processing of target documents using the Document Generation Wizard.
Create letters using the Dunning Wizard to notify customers of their open invoices and to remind them of overdue payments.
Add predefined text to a document with the built-in text editor.
Note
These functions are supported only in the generic print layouts of A/R invoices and sales quotations.
In addition, you can generate reports in various levels of detail that give you a picture of the sales activities of your business.