Changing Last Name "required" attribute in SugarCRM

In SugarCRM, person name consist of First Name and Last Name and Last Name is a required field ( Fir开发者_如何学JAVAst Name optional ) . How can remove required attribute from last_name and make First Name as required instead? Will it work without ripple effect?

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Refer the given link for answer,

http://www.sugarcrm.com/forums/f6/how-change-last-name-required-user-module-69943/