diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4d9a67bdc3..8c4b1a89385 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,7 +30,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We fixed an issue where the "Import" -> "Library to import to" did not show the correct library name if two opened libraries had the same suffix [#9567](https://github.com/JabRef/jabref/issues/9567)
 - We fixed an issue where the rpm-Version of JabRef could not be properly uninstalled and reinstalled [#9558](https://github.com/JabRef/jabref/issues/9558), [#9603](https://github.com/JabRef/jabref/issues/9603)
 - We fixed an issue where the command line export using `--exportMatches` flag does not create an output bib file [#9581](https://github.com/JabRef/jabref/issues/9581)
-
+- We fixed an issue where custom field in the custom entry types could not be set to mulitline [#9609](https://github.com/JabRef/jabref/issues/9609)
 
 
 
diff --git a/src/main/java/org/jabref/model/entry/field/IEEEField.java b/src/main/java/org/jabref/model/entry/field/IEEEField.java
index 9050810629d..da0a47274b6 100644
--- a/src/main/java/org/jabref/model/entry/field/IEEEField.java
+++ b/src/main/java/org/jabref/model/entry/field/IEEEField.java
@@ -30,7 +30,7 @@ public enum IEEEField implements Field {
         this.properties = EnumSet.of(first, rest);
     }
 
-    public static <T> Optional<IEEEField> fromName(String name) {
+    public static Optional<IEEEField> fromName(String name) {
         return Arrays.stream(IEEEField.values())
                      .filter(field -> field.getName().equalsIgnoreCase(name))
                      .findAny();
diff --git a/src/main/java/org/jabref/model/entry/field/UnknownField.java b/src/main/java/org/jabref/model/entry/field/UnknownField.java
index a4765163c18..f1de44ce00a 100644
--- a/src/main/java/org/jabref/model/entry/field/UnknownField.java
+++ b/src/main/java/org/jabref/model/entry/field/UnknownField.java
@@ -7,14 +7,21 @@
 
 public class UnknownField implements Field {
     private final String name;
+    private final Set<FieldProperty> properties;
 
     public UnknownField(String name) {
         this.name = name;
+        this.properties = EnumSet.noneOf(FieldProperty.class);
+    }
+
+    public UnknownField(String name, FieldProperty first, FieldProperty... rest) {
+        this.name = name;
+        this.properties = EnumSet.of(first, rest);
     }
 
     @Override
     public Set<FieldProperty> getProperties() {
-        return EnumSet.noneOf(FieldProperty.class);
+        return properties;
     }
 
     @Override
@@ -47,7 +54,7 @@ public int hashCode() {
     @Override
     public String toString() {
         return "UnknownField{" +
-                "name='" + name + '\'' +
-                '}';
+               "name='" + name + '\'' +
+               '}';
     }
 }