SAP QIM capture screen - to add 2nd Business Partner field

Hi

I am creating new Issue Type for SAP QIM.

I am using FPM to add custom fields to the  Issue Overview sreen.  I want two fields - one for Originator and one for Recipient, both to be for capturing Business Partners.

I can use the existing Reported By field for one, but need a second field to capture a Business partner.

I have created a new text field, but cannot figure out to make it of type Business Partner - i.e. when you click on drop down you must get Business Partner option.

Any ideas?

Much appreciated

Regards

Marieta