Tax code INVOIC02 Logistics Invoice verification

Hi all,

I have a scenario in which I need to derive the tax code for inbound INVOIC02 Idocs (MM/Logistics Invoice Verification)

from a number of differen fields in the IDoc.

There's a user exit, EXIT_SAPLMRMH_012 however it won't let me read any of the other IDoc segments (why is that, SAP??).

Is there any other way to change the tax code?

Thanks

Sven