TMW - How to change Att/absence reason field in Time Event tab as Mandatory

Hi,

Can any one suggest me how to change "Att/absence reason" field in TMW, Time Event tab as Mandatory? Currently this field always comes as option in TMW, even this filed is Mandatory in Module Pool. In PA30 this filed in coming manadatory in IT2011, however in TMW it is coming as option. Our requirement is in TMW also this field must be mandatory.

Thanks in advance for your help!

Regards,

Nirmod