Hello Andrew,
1488135 - Database compression for SQL Server note is for ABAP servers and tells to check "Using SQL Server Database Compression with SAP NetWeaver" in http://www.sdn.sap.com/irj/sdn/sqlserver link.
The document that is directed by sqlserver page is saying that "SAP NetWeaver Application Server Java does not currently support SQL Server database compression". Here is the link for the document.
Using SQL Server Database Compression with SAP NetWeaver
This document is written in 2011. This rule could have changed for newer versions maybe. But unfortunately there is no link on scn sqlserver page.
Regards,
Yuksel AKCINAR