Access to variables in an until clause of a wait activity

Hi,
I want to write a wait activity waiting for a variable to be set to a specific value. My code is something like
<process name="VacationRequest" targetNamespace="http://xmlns.oracle.com/Test" xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/" xmlns:bpws="http://schemas.xmlsoap.org/ws/2003/03/business-process/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" >
<variables>
<variable name="isDataFollowedUp" type="xsd:string"/>
</variables>
<wait name="Wait_For_DataFollowedUp" until="bpws:getVariableData('isDataFollowedUp') = string('true')"/>
</process>
The process is valid but compiling it I get the folowing warning:
Warning(110):
[Fehler ORABPEL-10070]: ungültiger deadline-Ausdruck
[Beschreibung]: in Zeile 110 von "C:\Programme\cygwin\home\hhuber\cvs-out\mywork\VacationRequest\process\VacationRequest.bpel", deadline-Ausdruck "bpws:getVariableData('isDataFollowedUp') = string('true')" in <wait> hat ein falsches Format.
[Mögliche Behebung]: wenn der deadline-Ausdruck ein Literal ist, vergewissern Sie sich, dass der Literal-Ausdruck in einfache Anführungszeichen oder " gesetzt ist. Beispiel: "'bpws:getVariableData('isDataFollowedUp') = string('true')'".
(sorry for german output, essentially it states that the deadline expression does have the wrong format and if it icomprises a literal I should make sure it is surrounded by single quotes).
I cannot figure out what's wrong with my code (and I've already tried some quoting stuff...), so I would be grateful for any hints.
Thanks in advance,
Hans.

just first idea.
define boolean variable isValid. initiate to false.
define boolean variable isFinished. initiate to false
put while activity with expression not isFinished
place inside while pick activity. Into pick activity place two onMessage activity, one for user action1 and another for user action2. You can remove onAlarm flow.
onMessage action1 will be responsible for validating user input and seting isValid to true if input is correct.
onMessage action2 will check whether isValid is true and if yes then it will perform required operation and after that it will setup isFinished to true. Otherwise it will ignore user input.
Does it solve your scenario?

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