Customize Account Software for Trading Company

The finished system should allow management to answer these questions immediately:

How much stock do we have?
How much money do customers owe us?
How much do we owe suppliers?
How much cash is available?
What is the total cost of each shipment?
What profit did we make on each shipment/customer/product?
Which supplier/customer transactions are pending?
What taxes are payable/recoverable?
What shipments are currently under execution?

The core philosophy should be:
One export shipment = one complete commercial file containing purchase, inventory, logistics, expenses, sales, payment and profitability information.