2 PPP multilinks between same 2 routers

Gents ,
One of our customers wants 2 PPP Multilinks between the PE and his CE.
Both of them never come up together although all member links are active and up.
When i tried to administratively shut down one of them the other comes up and vice versa.
Please give me your opinions and advices.
Thank you.

Hello ,
Ok i will make it much clearer now , we have 4 E1 leased lines between the PE and the CE with static routing between the PE-CE.
The customer is splitted into two major dept's or zones so he wants two separate links with different IP's joining between him and us.
We put 2 E1 links in each multilink and after that we discovered what i've recently described.
Both of the MLPPP never become active at the same time. i.e You should disable one of them inorder for the other to be active and reachable via layer 3 information.
Thank you and i appreciate your response.

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