XI to CRM XIF Connection

Hello,

I have been scrolling through some forums and seem to see mixed answers on a solution regarding connecting between SAP XI into CRM's XIF. Here is my scenario: I have a legacy system that will be passing an XML document into SAP XI. This document then needs to be mapped into an IDOC and passed into CRM via XIF. The reason we need to go through XIF is because the data NEEDS to be transferred via the middlewear.

Here are my questions:

1. Is the scenario above possible? What would be the best apapter to use?

2. We are on version 3.0 of XI, do we need to be on PI before we implement this interface?

Any feedback will be greatly appreciated.

Thank you.