Accounting module required to be integrated into existing VB desktop application

I have a working clinical management software built on vb.net front end and sql server back end. I am using also DevExpress 12.10 I want to add accounting capabilities and other options as below: 1. Accounting: • General Ledger Accumulates and provides financial reports on business activity via reports such as: Income statements, Profit and lose, Balance sheets, income and expenses by department, and cost center. This includes chart of accounts definition and Journal Voucher entries and period closing • Accounts Payable and Receivable Records bills and invoices for product and service purchases, and purchase returns tracks expenses, schedules payments for vendor bills based on due dates and prints checks. Tracks unpaid customer/patients invoices with aging reports assisting to insure that unpaid invoices do not become too old to be collected. Customer invoices are most often not part of the AR program. • Cash Management Manage cash accounts with features such as: bank reconciliation, tracking transfers between cash accounts and cash forecasting. Petty cash management linked to employee record (which employee manage the petty cash) • Fixed Assets Tracks purchase costs, depreciation and sale of business equipment, furniture, vehicles and buildings. 2. Inventory Management • Inventory Management Tracks inventory. Inventory control may include features such as: serial number tracking, sales product, product purchase history, cost and lead time, product description and location. 2. HR • HR Keep records of employees details and all their related documents, their leaves and resumptions, their payroll Social Network • Social Networks Connect to face book account and post information to the clinic account, same with twitter and Instagram Developer should deliver source code that matches my existing application and provide the required help till the full integration