diff --git a/NEWS.md b/NEWS.md
index c9d0b7284..f8c4194b0 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,6 @@
+## 5.0.6 2021-11-12
+* ERM-1917 Duplicate title instance created on package import in Kiwi bugfest (incoming issn now maps to eissn in system)
+
 ## 5.0.5 2021-11-10
  * ERM-1917 Duplicate title instance created on package import in Kiwi bugfest
 
diff --git a/service/gradle.properties b/service/gradle.properties
index bb8600b45..ff3f06868 100644
--- a/service/gradle.properties
+++ b/service/gradle.properties
@@ -11,6 +11,6 @@ gradleWrapperVersion=5.4
 
 # Application
 appName=mod-agreements
-appVersion=5.0.5
+appVersion=5.0.6
 dockerTagSuffix=
 dockerRepo=folioci
diff --git a/service/grails-app/services/org/olf/TitleInstanceResolverService.groovy b/service/grails-app/services/org/olf/TitleInstanceResolverService.groovy
index 866d2af35..ea0991b18 100644
--- a/service/grails-app/services/org/olf/TitleInstanceResolverService.groovy
+++ b/service/grails-app/services/org/olf/TitleInstanceResolverService.groovy
@@ -499,6 +499,37 @@ class TitleInstanceResolverService implements DataBinder{
     identifiers?.findAll( { IdentifierSchema id -> class_one_namespaces?.contains( id.namespace.toLowerCase() ) })?.size() ?: 0
   }
 
+
+  // On the rare chance that we have `eissn` in our db (From before Kiwi namespace flattening)
+  // We attempt to map an incoming `issn` -> `eissn` in our DB
+  private String mapNamespaceToElectronic(final String incomingNs) {
+    String ouput;
+    switch (incomingNs.toLowerCase()) {
+      case 'issn':
+        ouput = 'eissn'
+        break;
+      case 'isbn':
+        ouput = 'eisbn'
+      default:
+        break;
+    }
+  }
+
+  // On the rare chance that we have `pissn` in our db (From before Kiwi namespace flattening)
+  // We attempt to map an incoming `issn` -> `pissn` in our DB
+  private String mapNamespaceToPrint(final String incomingNs) {
+    String ouput;
+    switch (incomingNs.toLowerCase()) {
+      case 'issn':
+        ouput = 'pissn'
+        break;
+      case 'isbn':
+        ouput = 'pisbn'
+      default:
+        break;
+    }
+  }
+
   /**
    * Being passed a map of namespace, value pair maps, attempt to locate any title instances with class 1 identifiers (ISSN, ISBN, DOI)
    */
@@ -532,9 +563,32 @@ class TitleInstanceResolverService implements DataBinder{
          * We have to know that eissn == issn etc... Use namespaceMapping function
          */
 
-         // TODO we have the possibility for Kiwi that an existing TI is in place with namespace eissn, since cleanup is a complicated matter
-         // For the time being, allow matching BOTH of `eissn` to `issn` (As per the story), but also `issn` to `eissn` in our db
-        final List<Identifier> id_matches = Identifier.executeQuery('select id from Identifier as id where id.value = :value and (id.ns.value = :mns or id.ns.value = :ns)',[value:id.value, ns:id.namespace, mns:namespaceMapping(id.namespace)], [max:2])
+        /* NOTE: We have the possibility for Kiwi that an existing TI is in place with namespace eissn,
+         * since cleanup is a complicated matter.
+         * For the time being, allow matching BOTH of `eissn` -> `issn` (As per the story),
+         * but also `eissn` -> `eissn` AND `issn` -> `eissn` in our db.
+         * To allow for `eissn` -> `eissn` the (ns:id.namespace) case is sufficient.
+         * To allow for `issn` -> `eissn` we also need
+         */
+        final List<Identifier> id_matches = Identifier.executeQuery("""
+          SELECT id FROM Identifier AS id
+          WHERE
+            id.value = :value AND
+            (
+              id.ns.value = :nsm OR
+              id.ns.value = :ns OR
+              id.ns.value = :ens OR
+              id.ns.value = :pns
+            )""".toString(),
+          [
+            value:id.value,
+            ns:id.namespace.toLowerCase(),
+            nsm:namespaceMapping(id.namespace),
+            ens:mapNamespaceToElectronic(id.namespace),
+            pns:mapNamespaceToPrint(id.namespace)
+          ],
+          [max:2]
+        )
 
         if (id_matches.size() > 1) {
           throw new RuntimeException("Multiple (${id_matches.size()}) class one matches found for identifier ${id.namespace}::${id.value}");
diff --git a/service/src/main/groovy/org/olf/export/KBart.groovy b/service/src/main/groovy/org/olf/export/KBart.groovy
index 3098d9d1c..a98143c5e 100644
--- a/service/src/main/groovy/org/olf/export/KBart.groovy
+++ b/service/src/main/groovy/org/olf/export/KBart.groovy
@@ -215,7 +215,8 @@ public class KBart implements Serializable {
     return header as String[]
   }
 
-  // This method assumes it is being called on identifiers from within our database. Therefore any eissn or pissn will have been flattened to just issn
+  // This method assumes it is being called on identifiers from within our database.
+  // Therefore any eissn or pissn *should* have been flattened to just issn, but may not have been
   static String getIdentifierValue(Object identifiers) {
     if (identifiers) {
       Iterator iter = identifiers.iterator();
@@ -224,9 +225,17 @@ public class KBart implements Serializable {
       while (iter.hasNext()) {
         IdentifierOccurrence thisIdent = iter.next()
         Identifier ident =  thisIdent.identifier
-          if (ident?.ns?.value == "issn") {
+          if (
+            ident?.ns?.value == "issn" ||
+            ident?.ns?.value == "eissn" ||
+            ident?.ns?.value == "pissn"
+          ) {
             issn = ident.value
-          } else if (ident?.ns?.value == "isbn") {
+          } else  if (
+            ident?.ns?.value == "isbn" ||
+            ident?.ns?.value == "eisbn" ||
+            ident?.ns?.value == "pisbn"
+          ) {
             isbn = ident.value
           } else if (ident?.ns?.value == "doi") {
             doi = ident.value