Change Layout

Dear Seniors,

I am a MM consultant. When posting invoice, it is showing the affected G/L accounts. I would like to see the transaction event key which has been affected along with the G/L accounts. I have saerched in chaging layouts. I heard that in standard layout, transaction will be there to diplay transaction event keys. But in my system it is not there. I am using standard layout only. How could i create transaction in my layout so that i can get the transaction event keys along with the G/L accounts while posting invoice.

Kindly help me please.

Regards,

JanaMM