fix: Fixed customer address variable, sales invoice item field currency issue

(cherry picked from commit 904010ab645fdb16f09072c062269945f7747712)
diff --git a/erpnext/erpnext_integrations/taxjar_integration.py b/erpnext/erpnext_integrations/taxjar_integration.py
index 2a7243c..39aac0c 100644
--- a/erpnext/erpnext_integrations/taxjar_integration.py
+++ b/erpnext/erpnext_integrations/taxjar_integration.py
@@ -262,7 +262,7 @@
 	if doc.shipping_address_name:
 		shipping_address = frappe.get_doc("Address", doc.shipping_address_name)
 	elif doc.customer_address:
-		shipping_address = frappe.get_doc("Address", doc.customer_address_name)
+		shipping_address = frappe.get_doc("Address", doc.customer_address)
 	else:
 		shipping_address = get_company_address_details(doc)