Janusz

1) Customer's need branches that contain their address details etc. After adding a customer, Click on Customer Branches and add a branch. Don't forget to select the tax applicable to the customer's branch.
1a) When you first go into Invoice etc. you can see a line with your first product - but it's not actually a line on your sale/invoice yet until you click 'Add Item'. It's just there as a display first. It won't be there when you finish the transaction.
2) Not sure what you've done here. I don't think Sale Orders create GL entries though - they are just orders (Am I right here guys?).
3) In the "Items and Inventory" tab, just click Inventory Adjustmetns and accept your stock.
4) Yes - it should do. When they pay, you make a payment, and then next allocated this to their open orders.

Hope this helps.

Could you kindly assist me address a few concerns.

1. I have been trying to invoice a few customers that I've created but any time I click on direct sales invoice this error msg reads 'the selected customer has no branch' or something like that.
Now I managed to get the invoice box appearing alright but it always comes with an already filled out page of a customer and item and so on. When I change it to my desired info and click 'process invoice' the error msg says 'You must enter at least one non empty item line'. When I click ''add item'' to enter another line and click, then it works but I don't need the additional item line any way.
So what does the system mean by non empty item line?

2. Why doesn't the general ledger journal entry process when you enter a figure of 0.00?

3. How do I enter new stock arrivals into inventory for it to reflect on the stock level.
   
4. Upon successful invoicing of a customer does the system debit the customers account accordingly?

Thanks.