diff --git a/src/clj/auto_ap/jobs/ntg.clj b/src/clj/auto_ap/jobs/ntg.clj
index 3c925915..6c21fce3 100644
--- a/src/clj/auto_ap/jobs/ntg.clj
+++ b/src/clj/auto_ap/jobs/ntg.clj
@@ -102,7 +102,14 @@
                                                     :db/id (random-tempid)
                                                     }]})))
            (filter :invoice/client)
-           (into []))
+           (reduce (fn [[seen-so-far list] i]
+                     (let [k [(:invoice/invoice-number i) (:invoice/client i)]]
+                       (if (seen-so-far k)
+                         [seen-so-far list]
+                         [(conj seen-so-far k) (conj list i)])))
+                   [#{} []])
+           (second)
+           )
       (catch Exception e
         (log/error ::cant-import-general-produce
                    :error e)