Have you gone through this section in the manual?
(Seems the manual was not updated to reflect currently supported HP-UX version, so, you need to check for 11.31 paths. )
To create an HP-UX SRT
......
BMR searches for the following directory
(x.x is either 11.00 or 11.11): #### ( I think the manual was not updated from older versions to reflect 11.31)
■ Ignite-UX/FILE-SRV-x.x/opt/ignite/data/Rel_B.x.x/(BOSdatapath)
If the BOSdatapath directory is found, BMR expects the Ignite installation image to be in one of the following directories. (Note that -PA indicates Ignite version B41.)
■ Ignite-UX/BOOT-KERNEL/opt/ignite/data
■ Ignite-UX/BOOT-KERNEL/opt/ignite/boot
■ Ignite-UX/BOOT-KERNEL-PA/opt/ignite/data
■ Ignite-UX/BOOT-KERNEL-PA/opt/ignite/boot
If the BOSdatapath directory is not found, BMR looks for a file named INSTCMDS from the tar file supplied in one the
following directories: (Note that -PA indicates Ignite version B41.)
■ Ignite-UX/BOOT-KERNEL/opt/ignite/data
■ Ignite-UX/BOOT-KERNEL-PA/opt/ignite/data
If the file is not found, BMR cannot install Ignite.
So, please check the folder structure that you have specified to ensure that the required folders and files exist.
You may also want to log a Support call with Veritas to point out the outdated in the NBU manuals.
I have also checked the 8.1.2 BMR manual - it's exactly the same.