This module allows you to mention discount on Total of sale order and Total of Customer Invoice in two ways

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1. As percentage
Select 'Percentage' from Discount type and give discount percentage as Discount rate. System will update the value of Discount and Total

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2. As amount
Select 'Amount' from Discount type and give discount amount as Discount rate. System will update the value of Discount and Total

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And the module also allows you to set a limit for total discount in percentage. Exceeding this limit will require approval.