diff --git a/weboob/applications/boomoney/boomoney.py b/weboob/applications/boomoney/boomoney.py
index 65f13381bd9eed99db46d335642e409ba3373fa5..39f7b968456ad1b655bc551fd790288ee2a2e648 100644
--- a/weboob/applications/boomoney/boomoney.py
+++ b/weboob/applications/boomoney/boomoney.py
@@ -249,7 +249,11 @@ def run(self):
                                 else:
                                     field[f] = value
                                     if f not in fields.strip().split(" "):
-                                        fields = fields + f + " "
+                                        # MSMoney does not like when CHECKNUM is after MEMO
+                                        if f == "CHECKNUM":
+                                            fields = fields.replace("MEMO", "CHECKNUM MEMO")
+                                        else:
+                                            fields = fields + f + " "
 
                 if not IGNORE:
                     # dump transaction