ABAP Webdynpro component for travel request - customization

Hi All,
In EHP5 ESS Travel Management - Travel expense creation - I want to prevent users from raising the travel expense only after the travel request is approved.
For this requirement , ie to modify the FITV_POWL_TRIPS - In this component either i want to disbale the link create /change in travel expense colum if the travel request is not approved or i want to give a error message on click of travel expense report if the corresponding travel request is not approve.
If any one has done please let me know how this can be done . If with customising the code is there any way through spro config this can be controlled.
Thanks
Thanks & Regards
Shyam

You can use P_TRAVL authorisation check for the status field
Read here
http://help.sap.com/saphelp_46c/helpdata/en/b6/cda0db49e911d189060000e8322f96/content.htm
Please kindly read the note 574467. We deliver the BADI
FITV_PERSNO_AUTH_CHK empty and we provide a documentation on how
this should work. In your case you should modify the BADI to check your
multiple structural profile but on how to do this depends on your
modification.

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