Fixed #658

public/js/ff/transactions/single/common.js

@@ -8,6 +8,8 @@
 
 /** global: Modernizr, accountInfo, currencyInfo, accountInfo, transferInstructions, what */
 
+var countConversions = 0;
+
 $(document).ready(function () {
     "use strict";
     setCommonAutocomplete();
@@ -118,6 +120,12 @@ function convertForeignToNative() {
  * @param data
  */
 function updateNativeAmount(data) {
+    // if native amount is already filled in, even though we do this for the first time:
+    // don't overrule it.
+    if(countConversions === 0 && $('#ffInput_native_amount').val().length > 0) {
+        countConversions++;
+        return;
+    }
     $('#ffInput_native_amount').val(data.amount);
 }