diff --git a/framework/src/main/java/de/hsadmin/module/property/mapping/DefaultStringSetParameterMapMapper.java b/framework/src/main/java/de/hsadmin/module/property/mapping/DefaultStringSetParameterMapMapper.java
index fb6c1b6..ce5c267 100644
--- a/framework/src/main/java/de/hsadmin/module/property/mapping/DefaultStringSetParameterMapMapper.java
+++ b/framework/src/main/java/de/hsadmin/module/property/mapping/DefaultStringSetParameterMapMapper.java
@@ -2,6 +2,7 @@ package de.hsadmin.module.property.mapping;
 
 import java.util.Arrays;
 import java.util.Map;
+import java.util.Set;
 
 import de.hsadmin.common.error.TechnicalException;
 import de.hsadmin.common.error.UserException;
@@ -35,6 +36,16 @@ public class DefaultStringSetParameterMapMapper implements
 				idx++;
 			}
 		}
+		if (rpcParam instanceof Map<?, ?>) {
+			final Map<?, ?> rpcParamMap = (Map<?, ?>) rpcParam;
+			final Set<?> keySet = rpcParamMap.keySet();
+			strings = new String[rpcParamMap.size()];
+			for (int idx = 0; idx < strings.length; idx++) {
+				final Object object = keySet.toArray()[idx];
+				final String val = (String) rpcParamMap.get(object);
+				strings[idx] = val;
+			}
+		}
 		value.setStrings(strings);
 		return value;
 	}