change labels

Hi Guys:

How to change the captions of the filed in the standard transaction code.

<b>example:</b> In <b>Tcode : MM01</b> have a field lable called <b>order type</b> if i want suppose to change some <b>abacdefgh</b>. How can i go about on this change.

Please lemme know the po'ble ways.

Advacned Thanks

Suresh Babu Karanam