Here is how you can edit receipt prefix:
Step 1: Click on Menu on upper left corner of the screen
Step 2: Tap on Business Settings
Step 3: Select the Receipt ID Prefix section
Step 4: Add the values for PREFIX and Bill No.
Note:
When you enter a number for Bill No. as a prefix setting, all the receipts generated will begin with a +1 addition to value of Bill No.
For example, if the Bill No. is set to 341 the receipts generated will begin from 342.
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