Fixed reference naming error

src/main/java/org/gesis/dda/publishing/domain/impl/SmartExcelSheetBundlesSetSource.java

@@ -30,8 +30,7 @@ public class SmartExcelSheetBundlesSetSource implements BundlesSetSource {
         String sheetType = sheet.getSheetName();
         if(sheetName.contains(";")) {
         	sheetType = sheetName.substring(sheetName.indexOf(";")+1);
-            sheetName = sheetName.substring(0, sheetName.indexOf(";"));
-            this.reference = sheetName + "-" + UUID.randomUUID().toString() + "@@" + sheetName;
+            this.reference = sheetName.substring(0, sheetName.indexOf(";")) + "-" + UUID.randomUUID().toString() + "@@" + sheetType;
         } else {
         	this.reference = "excel-" + UUID.randomUUID().toString() + "@@" + sheetName;
         }