The Charge Value in the
Add New Charge window is the default value in the Items Total in any record. You can change the charge value later.
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For example, in Shipping and Handling Charge, you may have added the Charge Value of a Product as 100. You can change the Charge Value to 150 for that Product in the invoice. All you have to do is click on the Charges field and enter the charge value of your choice.