Hello,
Please refer consulting note
1875566 - APO on ERP:Release Note for SAP APO EHP3 on ERP 6.0 EHP6/7
There is PDF attached inside please go through it.
Also refer useful SAP help links,
SAP APO on SAP ERP - SAP Library
What's New in SAP ERP, Add-on for Embedded PP/DS - SAP Library
Best Regards,
R.Brahmnkar