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+# derive_vars_atc Test 2: error if facm not unique
+
+    Code
+      derive_vars_atc(dataset = cm, dataset_facm = facm)
+    Condition
+      Error in `signal_duplicate_records()`:
+      ! Dataset `dataset_facm` contains duplicate records with respect to `STUDYID`, `USUBJID`, `FAREFID`, and `FATESTCD`
+      Please check data and `by_vars` and `id_vars` arguments.
+      i Run `admiral::get_duplicates_dataset()` to access the duplicate records
+