As I said to you, @lubos updated the program a few weeks back to address an issue with inventory.
You need to put a quantity in as this will affect the inventory going up or down. If you have set the summary page to use cash basis, then it will not show the inventory sales until you have received the money from the client!
I would recommend that you use the summary page as accrual basis and use your reports as cash basis. This way, your tax returns etc all work in cash basis, but the summary page gives you a more accurate idea of the current financial state of your business in my opinion.
!. Put in a quantity in sales invoice - until Lubos fixes this issue because otherwise your inventory will never go up and down. This is problem one and has been reported here
Bug when invoicing inventory
2. Change the summary page to use accrual (set period) and this will show the sale of inventory and it will show accounts receivables which will make you aware of how much money clients owe you. I honestly don’t see the point of the cash basis view of the summary page. Once you have invoiced a client, that sale is regarded as good and should be reflected in your sales. Especially as the cash basis causes the exact confusion that you are experiencing where you have made a sale, but nothing seems to have happenend.
Remember accrual is when you invoice (sales and purchase) whereas cash basis, you only see the transaction once you have either paid money or received money - you have not received the money from the client so in cash basis you are not seeing the sale as yet.