RPD: How to use multiple-value variables in initialization blocks ?

Hi all,
I have a set of initialization blocks required for authentication, two of which are running row-wise. The first one sets a multi-valued variable, and the second one uses this variable.
Or at least, should use, because it actually fails. The NQServer log says
[nQSError: 13011] Query for Initialization Block 'My_Init_Block_2' has failed.
[nQSError: 23006] The session variable, NQ_SESSION.MY_VAR_1, has no value definition.
My first variable is initialized in a basic row-wise initialization block. What's more, if I say my 2nd block isn't required for authentication, and I read in a narrative the contents of my first variable, it contains the set of value I expect it to have.
can anybody please advise?
thanks in advance!
Cedric..

There is an example in the OBIEE Server Administration manual that looks very similar to your code except that the whole of the valueof string is quoted:
select
NAME, VALUE from RW_SESSION_VARS
where USERID='VALUEOF(NQ_SESSION.USERID)' {code}<br /><br /><br /><br />Pete

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