Making fields Account and contact as Non-mandatory in Campaign tasks

Hi Folks,

I have configured campaign to-do's (Campaign tasks) within a campaign.

Since the campaign is not targeted to an individual,I don't want to have the Account and contact fields as mandatory in my campaign tasks within a campaign.

I have tried using partner determination procedure by keeping min field empty for both these partners,but still not working?

Any suggestion how to achieve this?

Regards

Jayalakshmi.