Boolean() function gives true in all cases

The implementation of the boolean() function in BPEL (version 10.1.2.1.0) have an FATAL ERROR.
boolean(0) gives 1 and
boolean(false) gives 1
I have tried to make a TAR, however I cannot connect to meta-link today.
Regards,
Flemming

Thanks for your answer Clemens.
Perhaps, I missed to send you my test-case.
Try with the following assign, based on the schema below with input and output defined as boolean (in default generated bpel-syncron project):
<assign name="Assign_1">
<copy>
<from expression="boolean(bpws:getVariableData('inputVariable','payload','/client:TestIfProcessRequest/client:input'))"/>
<to variable="outputVariable" part="payload" query="/client:TestIfProcessResponse/client:result"/>
</copy>
</assign>
<types>
<schema attributeFormDefault="qualified"
elementFormDefault="qualified"
targetNamespace="http://xmlns.oracle.com/TestIf"
xmlns="http://www.w3.org/2001/XMLSchema">
<element name="TestIfProcessRequest">
<complexType>
<sequence>
<element name="input" type="boolean"/>
</sequence>
</complexType>
</element>
<element name="TestIfProcessResponse">
<complexType>
<sequence>
<element name="result" type="boolean"/>
</sequence>
</complexType>
</element>
</schema>
</types>
It gives the result
<TestIfProcessResponse>
<result>true</result>
</TestIfProcessResponse>
no mather what I gives as input in the BPEL Console.
I have tried with 0, 1, true, false.
Regards,
Flemming

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<pre>
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Boolean() function gives true in all cases

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