Passing Arguments to Scheduler Chains

I am stuck in chains here... ;-)

What already works is calling a program from a job, passing an argument to the program. So far, so good.
What I'm *trying* to do is to run a Scheduler Chain, where one of its steps start the said program.
Now, when I create a job to run the chain, I cannot add an argument value anymore with

DBMS_SCHEDULER.SET_JOB_ARGUMENT_VALUE because this throws an ora-27475.
Any ideas, anyone?

I'm on 11.2.0.2, but this question was asked before for 10g and never answered:
http://www.freelists.org/post/oracle-l/parametrized-programs-in-chains-in-10g,2

Kind regards,
Uwe

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