why the system validate paid_amount = invoice_total in sales invoice and POS invoice which make trouple when to try to return partly paid invoice.

[MhmedRjb]

Information about bug

Problem Overview

System checks when make a return for partly paid invoice If Total Invoice = Paid Amount

Scenario

Example

Item	Rate	Quantity
Item 1	500	1

• Total Invoice: 500
• Paid Amount: 250

If i tried to make a return i got this message

"Paid amount + Write Off Amount can not be greater than Grand Total" so to make a return, I have to change rate from 500 to 250 for making Total Invoice = Paid Amount

Item	Rate	Quantity
Item 1	250	1

• Total Invoice : 500
• Paid Amount : 250 Which does not make any sense and will be more difficult to manage with multiple items

code

def validate_pos(self):
if self.is_return:
	invoice_total = self.rounded_total or self.grand_total
	if flt(self.paid_amount) + flt(self.write_off_amount) - flt(invoice_total) > 1.0 / (
		10.0 ** (self.precision("grand_total") + 1.0)
	):
		frappe.throw(_("Paid amount + Write Off Amount can not be greater than Grand Total"))

what the point of validate that paid_amount = invoice_total If anyone can help why this validation exist

Module

accounts, selling

Version

Frappe 15 ERPnext 15

Installation method

None

Relevant log output / Stack trace / Full Error Message.

"Paid amount + Write Off Amount can not be greater than Grand Total"