Here we picked an Item Type that was a Session Pack Type. When this item is sold, it will add 10 sessions to the customers session account, and charge them $30.00 for it. Even though you type in the number of minutes when you rent the bed, if there are sessions on the account, one session will be deducted from the sessions on the customers account.
You will need to select an item type that has a Pack Type of Sessions. Do not change the Inventory Type on this screen. If it doesn't come in correctly, you did not choose or create the right kind of Item Type.
Note: If the customer has both sessions and minutes on their account, the sessions would be used up first, then the minutes.