R/3 Transaction Iviews vs Imported ABAP Roles on Portal

Hi,
In one of our requirement, Business needs to set up such that client should be able to have web based access to R/3 Transaction through Portal.
We can achieve that by creating system in portal and create Transaction iview with required T-code of R/3.
Whats wrong if we can define roles in ABAP system for a user with full hierirachy and import those ABAP roles into portals.and through portal we can give unified web based access to imported roles?
Does both the possibilities accomplish our need?what are main gaps between these two methods?
I want to go by Import method,Any suggestions please?
Cheers
Rani

Hi Michael,
I agree with you that the ABAP role has a complicated menu structure and uploading has to be done at regular basis.
Is there any mechanism through which any change in ABAP role structure in R/3 reflects in portal exactly so that there is no need of regular uploading?
If not?So in which business scenario uploading of ABAP roles into portals are helpful?whats the use?
Coming back to your second solution
It is much easier to have one transaction iView that starts transaction SMEN, which presents the user's full SAP menu in a single screen
But about about a user if he wants to navigate from this transaction SMEN to another transactions to which he is authorised to(R/3 Back-end)through this single Transaction iview.
In other words if we want to have access to 5 transaction iviews in R/3,do we need to create 5 corresponding transaction iviews in portals?How to achieve this requirement in a better way?
Waiting for you Reply
Bye and have a Nice Day
Rani

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R/3 Transaction Iviews vs Imported ABAP Roles on Portal

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