Purchasing Tool - like MF50 planning transaction?

Hello,

We have a requirement / need for a purchasing tool which basically works similar to the planning transcation code MF50

1. Shows all the total quantity and release amounts based on searching by vendor, or MRP controller etc

2. Allows the users to change the quantities which would then automatically update the releases of that material/vendor combination

Is anyone aware of a SAP tool which allows for this type of functionality? I know there isnt anything standard in the ERP side, but wasnt sure if SAP had a different tool which others are using for this type of work.

Thanks for any comments...