Setting the Approval Flag to True

If you define an approval process for a specific object and want the process to be initiated on click of a button, navigate to Create > Objects > <<Object Name>>Quote > <<Field Name>>Configure Products(Field) > Edit the formula field and add useAdvancedApproval=true. For example, IF ( LEN( Apttus_QPConfig__PriceListId__c ) > 0 , HYPERLINK("/apex/Apttus_QPConfig__ProposalConfiguration?id=" &Id&"&useAdvancedApproval=true&useDealOptimizer=true", IMAGE("/resource/Apttus_QPConfig__Button_Configure", "Configure Products"),"_self"), NULL).