diff --git a/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/Check.java b/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/Check.java
index 66d2c5ccd7037d4ad7f8b86346265e47e073cf14..2610cc122d0829cb17f7750ce902053d89e23022 100644
--- a/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/Check.java
+++ b/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/Check.java
@@ -126,7 +126,7 @@ public abstract class Check {
 	 */
 	public boolean canExecute(Checkable c) {
 		// ignore objects where this check doesn't apply to
-		if (!getApplicableToClasses().contains(c.getCheckClass())) {
+		if (!canBeApplied(c)) {
 			return false;
 		}
 		// check that object doesn't have errors for dependencies of this check
@@ -145,6 +145,15 @@ public abstract class Check {
 		}
 		return true;
 	}
+	
+	private boolean canBeApplied(Checkable c) {
+		for (Class<Checkable> checkableClass : getApplicableToClasses()) {
+			if (checkableClass.isAssignableFrom(c.getCheckClass())) {
+				return true;
+			}
+		}
+		return false;
+	}
 
 	/**
 	 * check anything
diff --git a/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/Checkable.java b/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/Checkable.java
index f53e78b7a29767c99d2566e22eebf3703b711f9a..1349baef3be02f1de4dec87158626446a36c0b48 100644
--- a/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/Checkable.java
+++ b/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/check/Checkable.java
@@ -74,6 +74,11 @@ public abstract class Checkable implements Serializable {
 	 * @return the GML-ID
 	 */
 	public abstract GmlId getGmlId();
+	
+	public boolean hasGmlId() {
+		return false;
+	}
+
 
 	/**
 	 * This should be called before executing a check if low memory consumption
diff --git a/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/GmlElement.java b/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/GmlElement.java
index 1e5c118e4be9bc767fc7a95a5ebae86e22314899..ea50cf2296b17c0348fbdba700bf8a7fee907f74 100644
--- a/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/GmlElement.java
+++ b/CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/GmlElement.java
@@ -73,4 +73,9 @@ public abstract class GmlElement extends Checkable {
 		}
 		return gmlId;
 	}
+	
+	@Override
+	public boolean hasGmlId() {
+		return gmlId != null;
+	}
 }