Violaine:
You can use a LINE statement within a COMPUTE block, however, the LINE statement can only execute BEFORE or AFTER a group:
[pre]
ods rtf file='c:\temp\showline.rtf';
proc report data=sashelp.class nowd;
column sex name age height;
define sex /group;
define name / order;
define age /mean;
define height/mean;
compute after sex;
line 'End of This Group';
endcomp;
break after sex/ summarize;
run;
ods rtf close;
[/pre]
So it would be hard to insert a break after any two girls, for example, or any two boys.
For more ideas on this problem, you might consider contacting Tech Support.
http://support.sas.com/techsup/contact/index.html
Good luck, cynthia