Show aggregarte value from table linked via multiple value lookup

I have two tables

Table A

Item 01 Due Date 25/02/12

Item 02 Due Date 28/02/12

Item 03 Due Date 12/03/12

Table B

Item 11 Linked To Item A and Item B

Item 12 Linked To Item A

Item 13 Linked To Item A and Item C

I'd like to be able to show, in Sharepoint 2010 Foundation, a report of Table B with the earliest due date from the linked records in Table A.

I have Sharepoint Designer, I'm prohibited from using code so it has to be from manipulating the xsl or OOB

I can get the report to show the date when linked to a single value but not multiple.