AX 2012 Vendor Invoice - subledger voucher creation

Hi Everyone,

I want to change description sub ledger voucher created by posting Purchase Order AX 2012. All this time, AX generate description for all sub ledger voucher from posting PO AX 2012 is “Vendor Invoice” What class should I change to override description generated for sub ledger voucher in invoice PO ?

Please help me to solve this if you really knows about it.

Thanks in Advance…