Track expenses on employees

Hey guys,

We are creating cost purchase orders to buy flight tickets for employees. We want to track the expense that we do for each employee. (And would like to fill the employee dimension for such ledger entries)
Currently there is no place in the PO where I can maintain the employee code.

Any idea of how this is handled in Infor LN.

Warm Regards,
Ganesh Ravindran Pillai