diff --git a/README.md b/README.md
index e0bcbb8..03b4617 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
-= OSC-Variant
+# OSC-Variant
 
 Anwendung zum Anpassen einer OSC-Datei an einen Standort.
 
-== Funktion
+## Funktion
 
 Diese Anwendung passt eine OSC-Datei so an, dass (standortbezogene) Formularvarianten für Formularverweise
 verwendet werden.
diff --git a/src/main.rs b/src/main.rs
index 62889f9..9655513 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -58,7 +58,9 @@ fn main() {
     let contents = fs::read_to_string(cli.input)
         .expect("Should have been able to read the file");
 
-    let xml: OnkostarEditor = from_str(contents.as_str()).unwrap();
+    let mut xml: OnkostarEditor = from_str(contents.as_str()).unwrap();
+
+    xml.apply_variant();
 
     let mut buf = String::new();
 
diff --git a/src/model/data_form.rs b/src/model/data_form.rs
index fb29d9e..bba9f33 100644
--- a/src/model/data_form.rs
+++ b/src/model/data_form.rs
@@ -144,6 +144,22 @@ pub struct DataForm {
     ansichten: Option<Ansichten>
 }
 
+impl DataForm {
+    pub fn apply_variant(&mut self) {
+        if self.name.starts_with("DNPM") {
+            self.entries.entry.iter_mut().for_each(|mut entry| {
+                if entry.type_ == "formReference" {
+                    if let Some(referenced_data_form) = &entry.referenced_data_form {
+                        if referenced_data_form == "OS.Tumorkonferenz" {
+                            entry.referenced_data_form = Some("OS.Tumorkonferenz.VarianteUKW".to_string())
+                        }
+                    }
+                }
+            })
+        }
+    }
+}
+
 #[derive(Serialize, Deserialize, Debug)]
 pub struct DataCatalogues {
     #[serde(rename = "DataCatalogue")]
diff --git a/src/model/onkostar_editor.rs b/src/model/onkostar_editor.rs
index 311100a..3956eb8 100644
--- a/src/model/onkostar_editor.rs
+++ b/src/model/onkostar_editor.rs
@@ -37,6 +37,17 @@ pub struct OnkostarEditor {
     editor: Editor
 }
 
+impl OnkostarEditor {
+    pub fn apply_variant(&mut self) {
+        self.editor.data_form.iter_mut().for_each(|data_form| {
+            data_form.apply_variant();
+        });
+        self.editor.unterformular.iter_mut().for_each(|data_form| {
+            data_form.apply_variant();
+        })
+    }
+}
+
 #[derive(Serialize, Deserialize, Debug)]
 pub struct InfoXML {
     #[serde(rename = "DatumXML")]
diff --git a/src/model/unterformular.rs b/src/model/unterformular.rs
index 1c50936..4945671 100644
--- a/src/model/unterformular.rs
+++ b/src/model/unterformular.rs
@@ -152,6 +152,22 @@ pub struct Unterformular {
     ansichten: Option<Ansichten>
 }
 
+impl Unterformular {
+    pub fn apply_variant(&mut self) {
+        if self.name.starts_with("DNPM") {
+            self.entries.entry.iter_mut().for_each(|mut entry| {
+                if entry.type_ == "formReference" {
+                    if let Some(referenced_data_form) = &entry.referenced_data_form {
+                        if referenced_data_form == "OS.Tumorkonferenz" {
+                            entry.referenced_data_form = Some("OS.Tumorkonferenz.VarianteUKW".to_string())
+                        }
+                    }
+                }
+            })
+        }
+    }
+}
+
 #[derive(Serialize, Deserialize, Debug)]
 pub struct DataCatalogues {
     #[serde(rename = "DataCatalogue")]