Added finance book filtering logic to financial_statements.py
diff --git a/erpnext/accounts/report/financial_statements.py b/erpnext/accounts/report/financial_statements.py
index dd47ca0..87b7ba1 100644
--- a/erpnext/accounts/report/financial_statements.py
+++ b/erpnext/accounts/report/financial_statements.py
@@ -375,6 +375,11 @@
 			additional_conditions.append("project = '%s'" % (frappe.db.escape(filters.get("project"))))
 		if filters.get("cost_center"):
 			additional_conditions.append(get_cost_center_cond(filters.get("cost_center")))
+		if filters.get("finance_book"):
+			additional_conditions.append("finance_book = '%s'" % frappe.db.escape(filters.get("finance_book")))
+		else:
+			additional_conditions.append("ifnull(finance_book, '') = ''")
+
 
 	return " and {}".format(" and ".join(additional_conditions)) if additional_conditions else ""