diff --git a/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/client/resources/PerunRegistrarTranslation.java b/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/client/resources/PerunRegistrarTranslation.java
index e2d0965c..970bfeed 100644
--- a/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/client/resources/PerunRegistrarTranslation.java
+++ b/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/client/resources/PerunRegistrarTranslation.java
@@ -139,6 +139,9 @@ public interface PerunRegistrarTranslation extends PerunTranslation {
 	@DefaultMessage("You must select at least one option!")
 	public String cantBeEmptyCheckBox();
 
+	@DefaultMessage("You must check this box!")
+	public String cantBeEmptySingleCheckBox();
+
 	@DefaultMessage("Incorrect email address format!")
 	public String incorrectEmail();
 
diff --git a/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/GroupCheckBox.java b/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/GroupCheckBox.java
index 6417bccb..9140f47b 100644
--- a/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/GroupCheckBox.java
+++ b/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/GroupCheckBox.java
@@ -1,5 +1,6 @@
 package cz.metacentrum.perun.wui.registrar.widgets.items;
 
+import com.google.gwt.user.client.Window;
 import com.google.gwt.user.client.ui.Widget;
 import cz.metacentrum.perun.wui.model.beans.ApplicationFormItemData;
 import cz.metacentrum.perun.wui.model.beans.ApplicationFormItemTexts;
@@ -24,6 +25,25 @@ public GroupCheckBox(PerunForm form, ApplicationFormItemData item, String lang)
 
 	private boolean preview = false;
 
+	@Override
+	protected Widget initWidget() {
+		super.initWidget();
+
+		boolean isGroupApplication = Window.Location.getParameter("group") != null;
+		if (isGroupApplication) {
+			for (Widget widget : getWidget()) {
+				if (widget instanceof CheckBox) {
+					CheckBox checkBox = (CheckBox) widget;
+					String[] parsedGroupName = checkBox.getText().split(Window.Location.getParameter("group") + ":");
+					// use group name without parent group prefix
+					checkBox.setText(parsedGroupName[1]);
+				}
+			}
+		}
+
+		return getWidget();
+	}
+
 	@Override
 	protected Widget initWidgetOnlyPreview() {
 		setSelectOptionsFromValue();
diff --git a/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/validators/CheckboxValidator.java b/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/validators/CheckboxValidator.java
index fdcc705a..ba999e2e 100644
--- a/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/validators/CheckboxValidator.java
+++ b/perun-wui-registrar/src/main/java/cz/metacentrum/perun/wui/registrar/widgets/items/validators/CheckboxValidator.java
@@ -24,7 +24,11 @@ public boolean validateLocal(Checkbox checkbox) {
 			} else {
 				// single checkbox - prefer own error message
 				setResult(Result.EMPTY);
-				checkbox.setRawStatus(getErrorMsgOrDefault(checkbox), ValidationState.ERROR);
+				String msg = getErrorMsgOrDefault(checkbox);
+				if (msg.equals(getTransl().incorrectFormat())) {
+					msg = getTransl().cantBeEmptySingleCheckBox();
+				}
+				checkbox.setRawStatus(msg, ValidationState.ERROR);
 			}
 			return false;
 		}
diff --git a/perun-wui-registrar/src/main/resources/cz/metacentrum/perun/wui/registrar/client/resources/PerunRegistrarTranslation_cs.properties b/perun-wui-registrar/src/main/resources/cz/metacentrum/perun/wui/registrar/client/resources/PerunRegistrarTranslation_cs.properties
index cf6ac553..1b743f5a 100644
--- a/perun-wui-registrar/src/main/resources/cz/metacentrum/perun/wui/registrar/client/resources/PerunRegistrarTranslation_cs.properties
+++ b/perun-wui-registrar/src/main/resources/cz/metacentrum/perun/wui/registrar/client/resources/PerunRegistrarTranslation_cs.properties
@@ -55,6 +55,7 @@ duplicateKeys=Každý klíč musí být unikátní!
 cantBeEmpty=Položka <b>nesmí být prázdná!</b>
 cantBeEmptySelect=Musíte vybrat jednu z možností!
 cantBeEmptyCheckBox=Musíte vybrat alespoň jednu možnost!
+cantBeEmptySingleCheckBox=Tuhle položku musíte označit!
 incorrectEmail=Neplatný formát e-mailové adresy!
 checkAndSubmit=Zkontrolovat a odeslat formulář
 passEmpty=Heslo <b>nesmí být prázdné!</b>