1 files changed, 6 insertions, 2 deletions
diff --git a/container-compiler-plugin/src/main/java/io/trygvis/container/compiler/SqlUnitModel.java b/container-compiler-plugin/src/main/java/io/trygvis/container/compiler/SqlUnitModel.java
index 568bbe7..1bd2535 100644
--- a/container-compiler-plugin/src/main/java/io/trygvis/container/compiler/SqlUnitModel.java
+++ b/container-compiler-plugin/src/main/java/io/trygvis/container/compiler/SqlUnitModel.java
@@ -67,13 +67,17 @@ public class SqlUnitModel {
     // -----------------------------------------------------------------------
 
     public SqlUnitModel add(SequenceMirror sequence, Element element) {
+        Element e = sequenceElements.get(sequence);
+        if (e != null && !e.equals(element)) {
+            throw new CompilerException(element, "This unit already contains a sequence called '" + sequence.name + "'.");
+        }
         sequences.put(sequence.name, sequence);
         sequenceElements.put(sequence, element);
         return this;
     }
 
-    public SqlUnitModel add(SequenceMirror... sequenceMirrors) {
-        for (SequenceMirror sequenceMirror : sequenceMirrors) {
+    public SqlUnitModel add(SequenceMirror... sequences) {
+        for (SequenceMirror sequenceMirror : sequences) {
             this.sequences.put(sequenceMirror.name, sequenceMirror);
         }
         return this;