Hi:
First, style=journal goes on the ODS statement, NOT on the PROC REPORT statement.
Second, a LINE statement is executed EVERY time the break occurs, so the only thing you can do to write the line "conditionally" is to make a text variable to hold the text you want for the occurrence. Then you use a different form of the compute block as explained in this Tech Support note:
http://support.sas.com/kb/37/763.html (The second code example that uses $varying. is the one you want to follow.)
cynthia