Step 1: Click on 
or Press the "Shift + F7" key on Keyboard
Step 2: Select "MPrice" Type with Click on the "Select" button or Press Enter key.
Step 3: Scan Item's Barcode on Barcode's Textbox.
Step 4: Repeat steps 1 to 3 for other items that will also be using MPrice.
Step 5: Once confirm, checkout the transaction and proceed with payment.