Add A/R Account to Receivables Export.

server/accounting/qbxml/qbxml-receivables.js

@@ -249,7 +249,9 @@ const generateInvoiceQbxml = (
                   )}:${generateJobTier(jobs_by_pk)}`
               ).trim(),
             },
-
+            ARAccountRef: {
+              FullName: bodyshop.md_responsibility_centers.ar.accountname,
+            },
             ...(jobs_by_pk.class
               ? { ClassRef: { FullName: jobs_by_pk.class } }
               : {}),