On the main Transactions Grid in the Transactions and Invoices Module, you will only see a row for the constituent that was the main contributor. You will not see a row for any constituent that received soft credit. 

However, when you open the constituent who received soft credit and go to their Transaction Tab, you will see the transaction. You just need to make sure you have the "include Soft Credits" check marked to see these transactions. There will be a column called “Soft Credit” that identifies any transaction that the constituent received soft credit for with a check mark.