diff --git a/src/main/resources/alma/fix/relatedRessourcesAndLinks.fix b/src/main/resources/alma/fix/relatedRessourcesAndLinks.fix
index 23302a28b..78878e0d7 100644
--- a/src/main/resources/alma/fix/relatedRessourcesAndLinks.fix
+++ b/src/main/resources/alma/fix/relatedRessourcesAndLinks.fix
@@ -349,7 +349,8 @@ do list(path:"775??|776??", "var":"$i")
       paste("related[].$last.note[].$append","$info", "$note")
       replace_all("related[].$last.note[].$last", "Erscheint auch als ","")
       copy_field("$label", "related[].$last.label")
-      copy_field("$issn", "related[].$last.issn")
+      set_array("related[].$last.issn[]")
+      copy_field("$issn", "related[].$last.issn[].$append")
       set_array("related[].$last.isbn[]")
       isbn("$isbn", to:"isbn13")
       copy_field("$isbn", "related[].$last.isbn[].$append")
@@ -361,6 +362,7 @@ end
 
 do list(path:"related[]", "var":"$i")
   uniq("$i.isbn[]")
+  replace_all("$i.issn[].*","-","")
 end
 
 replace_all("related[].*.id", "^\\(DE-605\\)(.*)$", "http://lobid.org/resources/$1#!")
diff --git a/src/main/resources/alma/index-config.json b/src/main/resources/alma/index-config.json
index 7ea2b8fb3..00d208b6d 100644
--- a/src/main/resources/alma/index-config.json
+++ b/src/main/resources/alma/index-config.json
@@ -265,13 +265,15 @@
               "type": "text"
             },
             "issn": {
-              "type": "keyword",
+              "type": "text",
+              "analyzer": "hyphen_analyzer",
               "copy_to": [
                 "q.all"
               ]
             },
             "isbn": {
-              "type": "keyword",
+              "type": "text",
+              "analyzer": "hyphen_analyzer",
               "copy_to": [
                 "q.all"
               ]
diff --git a/src/test/resources/alma-fix/990108873860206441.json b/src/test/resources/alma-fix/990108873860206441.json
index d6cff7a6d..62fdcd716 100644
--- a/src/test/resources/alma-fix/990108873860206441.json
+++ b/src/test/resources/alma-fix/990108873860206441.json
@@ -82,7 +82,7 @@
     "id" : "http://lobid.org/resources/ZDB-1027374-8#!",
     "note" : [ "Druckausg." ],
     "label" : "Behavioural pharmacology",
-    "issn" : "0955-8810"
+    "issn" : [ "09558810" ]
   } ],
   "inCollection" : [ {
     "id" : "http://lobid.org/organisations/DE-655#!",
diff --git a/src/test/resources/alma-fix/990119186660206441.json b/src/test/resources/alma-fix/990119186660206441.json
index 1ad05c109..3f3593c13 100644
--- a/src/test/resources/alma-fix/990119186660206441.json
+++ b/src/test/resources/alma-fix/990119186660206441.json
@@ -77,7 +77,7 @@
   "related" : [ {
     "note" : [ "Druck-Ausgabe" ],
     "label" : "Know your world extra",
-    "issn" : "0163-4844"
+    "issn" : [ "01634844" ]
   } ],
   "inCollection" : [ {
     "id" : "http://lobid.org/organisations/DE-655#!",
diff --git a/src/test/resources/alma-fix/991005935279706485.json b/src/test/resources/alma-fix/991005935279706485.json
index 41cd9f615..3762a9769 100644
--- a/src/test/resources/alma-fix/991005935279706485.json
+++ b/src/test/resources/alma-fix/991005935279706485.json
@@ -104,7 +104,7 @@
     "id" : "http://lobid.org/resources/ZDB-2722409-0#!",
     "note" : [ "Online-Ausg." ],
     "label" : "Wirtschaft und Erziehung.",
-    "issn" : "0174-6170"
+    "issn" : [ "01746170" ]
   } ],
   "inCollection" : [ {
     "id" : "http://lobid.org/resources/HT014846970#!",
diff --git a/src/test/resources/alma-fix/99370678063606441.json b/src/test/resources/alma-fix/99370678063606441.json
index dee19a627..8097330bb 100644
--- a/src/test/resources/alma-fix/99370678063606441.json
+++ b/src/test/resources/alma-fix/99370678063606441.json
@@ -63,7 +63,7 @@
     "label" : "ZDB-Ressource"
   } ],
   "related" : [ {
-    "issn" : "0720-6763"
+    "issn" : [ "07206763" ]
   } ],
   "inCollection" : [ {
     "id" : "http://lobid.org/resources/HT014846970#!",
diff --git a/src/test/resources/alma-fix/99370690532406441.json b/src/test/resources/alma-fix/99370690532406441.json
index 5c2c63f5d..4b7f7b267 100644
--- a/src/test/resources/alma-fix/99370690532406441.json
+++ b/src/test/resources/alma-fix/99370690532406441.json
@@ -59,7 +59,7 @@
     "label" : "Culturegraph Ressource"
   } ],
   "related" : [ {
-    "issn" : "1610-5982"
+    "issn" : [ "16105982" ]
   } ],
   "language" : [ {
     "id" : "http://id.loc.gov/vocabulary/iso639-2/ger",
diff --git a/src/test/resources/alma-fix/99370699582506441.json b/src/test/resources/alma-fix/99370699582506441.json
index 5da201e88..f76576c79 100644
--- a/src/test/resources/alma-fix/99370699582506441.json
+++ b/src/test/resources/alma-fix/99370699582506441.json
@@ -78,7 +78,7 @@
     "label" : "DNB-Ressource"
   } ],
   "related" : [ {
-    "issn" : "2190-0574"
+    "issn" : [ "21900574" ]
   } ],
   "inCollection" : [ {
     "id" : "http://lobid.org/resources/HT014846970#!",
diff --git a/src/test/resources/alma-fix/99371107766906441.json b/src/test/resources/alma-fix/99371107766906441.json
index 916900ca5..41e4d1c15 100644
--- a/src/test/resources/alma-fix/99371107766906441.json
+++ b/src/test/resources/alma-fix/99371107766906441.json
@@ -58,7 +58,7 @@
     "label" : "OCLC Ressource"
   } ],
   "related" : [ {
-    "issn" : "2471-5506"
+    "issn" : [ "24715506" ]
   } ],
   "language" : [ {
     "id" : "http://id.loc.gov/vocabulary/iso639-2/eng",
diff --git a/web/test/tests/IndexIntegrationTest.java b/web/test/tests/IndexIntegrationTest.java
index fb2579893..f3becab5d 100644
--- a/web/test/tests/IndexIntegrationTest.java
+++ b/web/test/tests/IndexIntegrationTest.java
@@ -80,6 +80,10 @@ public static Collection<Object[]> data() {
 			{ "isbn:9780702075551", /*->*/ 1},
 			{ "isbn:070-2075-558", /*->*/ 1},
 			{ "isbn:0702075558", /*->*/ 1},
+			{ "related.issn:07206763", /*->*/ 1 },
+			{ "related.issn:0720\\-6763", /*->*/ 1 },
+			{ "issn:21914664", /*->*/ 1 },
+			{ "issn:2191\\-4664", /*->*/ 1 },
 			{ "\"Handbook on policy, process and governing\"", /*->*/ 1},
 			{ "(+Handbook +on +policy +process +and +governing)", /*->*/ 1},
 			{ "\"Mülheim an der Ruhr\"", /*->*/ 1},
@@ -91,6 +95,7 @@ public static Collection<Object[]> data() {
 			{ "describedBy.resultOf.object.modifiedBy.id:\"http\\://lobid.org/organisations/DE-6#\\!\"", /*->*/ 15 },
 			{ "\"Reader-friendly\"", /*->*/ 1},
 			{ "\"Reader friendly\"", /*->*/ 1},
+			// all q tests are related to DigiBib
 			{ "q.date:2000", /*->*/ 3 },
 			{ "q.publisher:Aachen", /*->*/ 2 },
 			{ "q.publisher:Aachen\\-Eilendorf", /*->*/ 1 },
@@ -115,9 +120,11 @@ public static Collection<Object[]> data() {
 			{ "q.all:(Courtillon cinema)", /*->*/ 1 },
 			{ "q.all:(Courtillon cinéma)", /*->*/ 1 },
 			{ "q.all:0702075558", /*->*/ 1 },
-			{ "q.all:07\\-0207\\-555\\-8", /*->*/ 1 },
-			{ "q.all:07206763", /*->*/ 0 },
-			{ "q.all:0720\\-6763", /*->*/ 1 },
+			{ "q.all:07\\-0207\\-555\\-8", /*->*/ 1 }, // search with hyphens possible due to digibib_standardnumber
+			{ "q.all:07206763", /*->*/ 1 },
+			{ "q.all:0720\\-6763", /*->*/ 0 }, // search with hyphens not possible, different to lobid general search
+			{ "q.all:21914664", /*->*/ 1 },
+			{ "q.all:2191\\-4664", /*->*/ 0 }, // search with hyphens not possible, different to lobid general search
 			{ "q.all:HT072067630", /*->*/ 0 },
 			{ "q.all:(Erleben \\- Verstehen & Lernen)", /*->*/ 3 },
 			{ "q.all:(Lexicography \\: Selected Papers)", /*->*/ 1 },