Merge pull request #51655 from aerele/project-gross-margin-credit-note

fix: include credit notes in project gross margin calculation

Author: ruthra-kumar

erpnext/projects/doctype/project/project.py

@@ -308,6 +308,8 @@ def calculate_gross_margin(self):
 		self.gross_margin = flt(self.total_billed_amount) - expense_amount
 		if self.total_billed_amount:
 			self.per_gross_margin = (self.gross_margin / flt(self.total_billed_amount)) * 100
+		else:
+			self.per_gross_margin = 0
 
 	def update_purchase_costing(self):
 		total_purchase_cost = calculate_total_purchase_cost(self.name)