diff --git a/src/wce_crm/gui.py b/src/wce_crm/gui.py
index 49fd522..ed0a70e 100644
--- a/src/wce_crm/gui.py
+++ b/src/wce_crm/gui.py
@@ -3846,6 +3846,12 @@ class Page_Consulting(QWidget):
             case ConsultingType.INDIVIUAL:
                 self.type_individual_btn.setChecked(True)
 
+        # deactivate if at least one ID is set (type is pre-defined by how
+        # the site is called)
+        if self.STATE.un_id or self.STATE.pers_id:
+            self.type_pauschal_btn.setEnabled(False)
+            self.type_individual_btn.setEnabled(False)
+
         # call to child modules not needed because these are initialised by their own
         # "load_state" method which again calls the modules sync method