Adding Contract ID field to Sources of Supply field of SC

Hi Experts,

I have a requirement to add a custom field for Contract ID in Sources of supply field tab. Each supplier can have one or more contract and when i shopping is created the user have to select a contract of the that particular supplier. This Contract ID value have to flow to ECC   along with PO.

For adding field in Source to Supply field , is there any configuration through SPRO.

Thanks and Regards,

Ann MAthew