Cons of using 2 middlewares

Hi all,
Can anyone help in this ?
Let me explain my exact scenario:
We have an SAP ECC Server and a third-party application connected via biztalk. Now we need to connect SAP ECC system with SAP Enterprise Portal via a SAP PI System.
I need to know what would be the disadvantages of using 2 middlewares as mentioned above.
Also any documents you have to support would be appreciated.
Regards,
Malita

Hi
I dependend on the client requirement , some client do not want to replace their existing systems ,
Like i worked for a Sydney based client , they were having around 50 legacy systems , Tibco & XI was the two middleare boing used , here XI was getting the the data from Tibco , not by the legacy systems ..some transformation logic were handled at Tibco , some at XI ....
I do'nt think so there may be any disadvantage ..it may be just a landscape , as per client wants ....
Regards
Abhishek

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