specifically need to ask for custom conversion rates

common/proto/accounting.proto

@@ -111,6 +111,13 @@ message PostJournalRequest {
   // creating. Must be empty when appending. Rejected when it falls at or before
   // the latest closed or approved accounting boundary for the profile.
   string accounting_date = 7;
+
+  // Convert this posting with the profile's own rate for the publication date
+  // instead of the ECB reference rate. False, the default, always uses ECB, even
+  // where a custom rate for that date exists. True requires one to have been
+  // entered: a missing rate is refused rather than silently converted at the
+  // official rate. Ignored when nothing needs converting.
+  bool use_custom_rate = 8;
 }
 
 message JournalLineInput {