Adding custom fields to contracts (ME31K & ME31L)

Hi,

My knowledge of MM is limited.

Is it possible to ad some custome fields the contracts (ME31K and ME31L)? Both at the header level and at the item level?

I need to add some custom fields to the contract header and to the contract item(s). Then user these fields later for some additional (custom) funcationality, ex. in reports)

Thanks in advance.

Naing Zaw-Tun