Plz I need late payment charges

I need late payment charges (warrants) for sale invoice plz consider my problem sir

Did you read the Guide?

Sry I need fix late payment charge

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You need to be more specific. What is wrong that you need to fix? Please provide details.

I need to add a penalty for late payments for sales invoices in addition to the due amount the penalty should be a fixed amount only once for each due payment Not accumulated monthly

You cannot do that automatically. So you will need to edit the invoice by adding a line for the late payment fee and send a modified invoice.