Substitution in portal UWL

Hi
I had a question around the portal UWL, and I've tried SDN, SAP Help, Google, and still can't find a definitive answer; so I'm hoping someone here can help.
We run EP6 with an ECC5 backend, and our users are allowed to manage substitution via the portal universal worklist. One of our users (let's call them user A) has created a substitution rule for All Tasks, and set the nominee to Receive My Tasks. They have given this access to User B.
They have then created another rule and set the same attributes (so All Tasks, and set the nominee to Receive My Tasks), but set the substitute to User C. After that, they've done the same again, but to a third substitute (User D).
So, in total, they now have three rules but with three different substitutes. Does anyone know if this is supported? i.e. can you have multiple substitutes if you set them to receieve All Tasks?
The reason I ask is that if I look at the table HRUS_D2 in the ECC backend for User A, only one of the subsitutes will have an "X" in substitution active. My thinking is that the rule can only be active for one of the subtitutes at any one time, so it'll switch it on for however logs in to the portal first that day - or something along those lines.
Any thoughts?

Thanks for the prompt reply.
I don't have a screen shot of the rules, will need to get one sent over, but the user tells me this is how they were set up.
The issue has been raised by one of the substitutes, as sometimes they see that the subsitution is active in the portal UWL (they see a message along the lines of "Working on tasks for User A"), and other times it's not there (even though there are tasks currently open for User A). I've run the funciton module RH_SUBSTITUTES_LIST_NEW for User A to look at the substitutions as of today, and it says:
User A                  Substitution Profile                     Substitute Status         Assigned as of                    Assigned until
  User B                   General substitution                 Deactivated                     10.02.2010                        Unlimited
  User C                   General substitution                 Activated                        28.09.2009                        Unlimited
  User D                   General substitution                 Deactivated                     10.02.2010                        Unlimited
It's a strange one!

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