How Do I Match an Invoice to a Single PO Distribution Line?

Hello,

My PO has 1 PO LIne, 1 Shipment & 2 Distribution Lines.  I have one invoice that I want to match to only 1 of the distribution lines.  When I click the Match Button on the PO Line 1, I get a message to Match to Multiple Shipments or click cancel to match to a single distribution.  I clicked Cancel, but nothing happened.  I don't know how to view the Distribution Lines.

Any suggestions would be great!

Thanks

Jean ANn