Pre-Selected Checkbox

I have a problem with pre select a checkbox when opening the form:

<h:selectManyCheckbox id="ereignistyp" label="Ereignistyp"
                                collectionType="java.util.ArrayList"
                                value="#{uebergreifendeEreignisListQuerySpec.criterionMap['ereignistyp'].values}">
                                <f:converter converterId="criterionValueConverter" />
                                <f:selectItems
                                    value="#{d:enumsToSelectItems(uebergreifendeEreignisListQuerySpec.criterionMap['ereignistyp'].predefinedValues)}" />
                            </h:selectManyCheckbox>

uebergreifendeEreignisListQuerySpec.criterionMap['ereignistyp'].values is empty

while

uebergreifendeEreignisListQuerySpec.criterionMap['ereignistyp'].predefinedValues has [HFEHLER, PROTOKOLLEINTRAG, MAENGEL, HSONSTIGES, HALARM]

Even when manually define uebergreifendeEreignisListQuerySpec.criterionMap['ereignistyp'].values to values, the checkbox won't select but interal it is properly used and filtered.