For SAP (ABAP, Basis, Application) discussion, you can make used of the SAP and ABAP forum. It also serve as a place where SAP functional tips and sample ABAP programs are posted...
The SAP contents on this site will be on ABAP programming as well as other IMG stuff like MM, LE, SD, PP, HR, FI and BC. The SAP environments used here are version 4.6x onwards