adding check if setspec already exists

src/main/java/org/gesis/dda/wizard/web/rest/BundlesSourceResource.java

@@ -280,7 +280,7 @@ public class BundlesSourceResource {
             final String setSpec = getSetSpec(bundlesSource.getData(), bundlesSource.getType());
             if (null != setSpec) {
                 final String referenceOfBS = bundlesSource.getReference();
-                if (bundlesSource.getType() == BundlesSourceType.XSLT_OAI_PMH) {
+                if (bundlesSource.getType() == BundlesSourceType.XSLT_OAI_PMH && !referenceOfBS.contains("___")) {
                     bundlesSource.setReference(referenceOfBS + "___" + setSpec);
                 } else {
                     bundlesSource.setReference(referenceOfBS);