Receipts and invoices I wrote for customers are not affecting the inventory amount it remains the same not deducted.

SOLVED

I started using peachtree sage 50 US 2013 edition, I started with entering all the inventory, Customers and their beginning balances starting from 7/4/2016. Then from yesterday I started entering the sales made from 11/4/2016 when I started setting up Sage 50, But I noticed that the sales I was writing invoices and receipts for are not reducing my inventory at all. So please I want you to help me to correct this so that I can continue.
Regards.