Automatic conversion of opportunity and revenue line item to Purchase and Purchase line item

I learnt that in the SugarCRM Sell 10.1 version the purchase and purchase line items are automatically generated once the sales stage of revenue line item in the opportunity is updated to 'Closed won'.

This advanced feature is working only is some instances and is not working in other instances though the version of SugarCRM Sell is 10.1. Could you please help me why this feature is active in only some instances?