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Definition:This Function is to void receipt before payment.

From the Payment screen :

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Step 1. Click [Fast Void] button.
Step 2. Enter the Remarks, example wallet lost.
Step 3. Click [OK] button.

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Step 4. Check on the display screen you will see ***RECEIPT VOID*** on the bottom.
And the screen System will show Transaction Void complete.

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See this video:
Item Fast Void