PreInvoice 4 You for vtiger CRM

Extension allows you to create PreInvoice from Quotes and Sales Order without risk that buyer does not pay Invoice and you will have to cancel Invoice.

An abridged or estimated invoice sent by a seller to a buyer in advance of a shipment or delivery of goods.

Pre-Invoice features:

• Create new Pre-Invoice
• Create Pre-Invoice from Quotes
• Create Pre-Invoice from Sales Orders
• Create Pre-Invoice from Opportunities
• Pre-Invoice Information block in Detail view of records
• Support of CashFlow
• Compatible with PDF Maker & Email Maker
• Easy installation & usage
• Vtiger 7.x/6.x compatible

More info: http://www.it-solutions4you.com/extensions/vtiger/preinvoice-for-vtiger-crm/