test: fix property name
diff --git a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
index 12f2fe1..fb0bf99 100755
--- a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
+++ b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
@@ -166,7 +166,7 @@
sales_invoice.patient = appointment_doc.patient
sales_invoice.customer = frappe.get_value('Patient', appointment_doc.patient, 'customer')
sales_invoice.currency = frappe.get_value('Customer', sales_invoice.customer, 'default_currency') \
- or get_company_currency(appointment_doc.currency)
+ or get_company_currency(appointment_doc.company)
sales_invoice.appointment = appointment_doc.name
sales_invoice.due_date = getdate()
sales_invoice.company = appointment_doc.company