[% BLOCK sourcetab %]
[% IF ( records ) %]
[% END %]
[% END %] [% BLOCK mergesource %]

Source records

[% PROCESS sourcetab records=record1 recordnumber=1 defaultrecord=1 %] [% PROCESS sourcetab records=record2 recordnumber=2 defaultrecord=0 %]
[% END %] [% BLOCK mergetarget %]

Destination record

[% END %]