If you have Business Packages installed, take a look at the following SAP Notes that describes the overall SAP NetWeaver compatibility including overview of enabled Suite product versions:
- 2156543 - Add-on compatibility of SAP NetWeaver 7.5
- 1850345 - Add-on compatibility of SAP NetWeaver 7.4
- 1532805 - Add-On Compatibility of SAP NetWeaver 7.3
Check the detailed information in the attachments of:
- 2304435 - SAP ERP for SAP NetWeaver 7.5 hud systems
- 1874939 - SAP Business Suite for SAP NetWeaver 7.4 hub systems
- 1698276 - SAP Business Suite for SAP NetWeaver 7.31 hub systems
- 1615463 - SAP Business Suite 7i 2010 for SAP NetWeaver 7.3 hub systems
- 1468349 - SAP Business Suite 7 for SAP NetWeaver 7.3 hub systems
Read this blog for additional explanations.
Details about version interoperability and the supported software update strategies are described here.
If you are using SAP BI take a look at this useful note - Note 1636057 - Upgrade to SAP NetWeaver 7.30: BI Java: Useful note.
If you have ESS/MSS installed check out this blog.