Apply One Payment for Both a Membership and Service Package

Functions -> Point of Sale -> Product List
Click Apply Payment in the Action section  for the POS product called " Apply Membership Payment" 
Search my member name
In the action pane click apply payment for the correct member and membership
Click Continue

Click Apply Payment in the Action section  for the POS product called " Apply Service Payment"
Search by member name
In the action pane click apply payment for correct member and service package

This should put 2 items in your Cart
Click on Checkout

You will be at the payment screen with both items in the cart and you can proceed with the payment transaction