Build 288

• Added permission to change Credit Days for invoice
• Negative Revenue validation added
• Proforma/Final setting added for Invoice Templates
• Invoice Reversal Implemented
• Added option to reject Job Closing request
• Added Subject/Message when emailing form
• Fixed sorting issue on Invoices page
• Added account filter on Shipment Finance page
• Added Quick Edit function for Accounts
• Added "Allow Negative Revenue" setting for Companies