I think you should go with recommendation that BDSSA need to be upgraded first before upgrading BSA Appserver. Now as your BDSSA is running at 8.2, I suggest you to upgrade your BSA at 8.x. Note that direct upgrade from 7.5 to 8.3 SP2 is not validated path whereas 8.1/8.2 upgrade to 8.3 SP2 is validated path.
Gotcha, thanks, so my upgrade sequence is like this
- upgrade BDSSA from 2.0 >> 8.1 (done)
- upgrade BSA 7.5 >> 7.6
- upgrade BSA 7.6 >> 8.1
- upgrade NSH 7.5 >> 8.1
- upgrade BDSSA 8.1 >> 8.3 SP2
- upgrade BSA 8.1 >> 8.3 SP2