problem in getting meal allowance in memory for TE using BADI

I am facing some problems in trying to get the subsistence

allowance amount selected on the webdynpro screen using the implementation of the

BADI 'TRIP_WEB_CHECK'.

I am able to get all the screen values e.g the receipts but require the

subsistence amount to perform some budget check before i proceed to the

last step 'Review and Send' screen.

I have even stepped through the standard program and implemented some codes in the BAPI_TRIP_CHECK_STATUS (export_tables_for_simulation) where there is a portion

which performs the macro rp-imp-c1-te-myk that will return the subsistence allowance

amount. It always return value 4 instead of 0.

Is it because i am implemeting macro in a BADI and it is not allowed.

Appreciate if anyone could help on this ?

Thanks.

Huat