After upgrade Veritas product, if you run
# modinfo | grep vx
27  1241dbc  28f54 246   1  vxdmp (VxVM 4.0R_p4.7 (MP2): DMP Drive)
28 78018000 1cf418 247   1  vxio (VxVM 4.0R_p4.7 (MP2) I/O driver)
30 781c74d8    847 248   1  vxspec (VxVM 4.0R_p4.7 (MP2) control/st)
127 787c33e9    c23 249   1  vxportal (VxFS 4.0_REV-MP2f portal driver)
128 784ac000 165c95   8   1  vxfs (VxFS 4.0_REV-MP2f,116689-02 (Su)
157 78766000   5972 253   1  vxgms (VxGMS 4.0 (SunOS))
158 787a0000  39799 245   1  vxfen (VRTS Fence 4.0MP2)
165 7832e000  1c638 252   1  vxglm (VxGLM 4.0 (SunOS 5.9))

In this case we have version 4.0 for example VRTSvxfs but when you run
#pkginfo -l VRTSvxfs
  PKGINST:  VRTSvxfs
     NAME:  VERITAS File System
 CATEGORY:  system,utilities
     ARCH:  sparc
  VERSION:  3.2,REV=GA04
  BASEDIR:  /
   VENDOR:  VERITAS Software
     DESC:  Commercial File System
   PSTAMP:  VERITAS-FS-3.2.0-2002-06-17-3.2MP4
 INSTDATE:  May 04 2002 13:41
  HOTLINE:  (800) 342-0652
    EMAIL:  support@veritas.com
   STATUS:  completely installed
    FILES:      233 installed pathnames
                 36 shared pathnames
                  5 linked files
                 48 directories
                 74 executables
                  5 setuid/setgid executables
              51407 blocks used (approx)

Here it show version 3.2 and you know for sure you install a correct version 4.0 or check the package which you installed from to make sure it is a correct version

Here are the steps we need to check:

1/- check in /var/sadm/pkg/<Product name>/pkginfo ----> in this example it will be /var/sadm/pkg/VRTSvxfs/pkginfo   make sure it show a correct version
2/- make sure you are boot up from correct boot device by running
# prtconf -vp | grep boot
   boot-retained-page:  
       bootargs:  00
       bootpath:  '/pci@1c,600000/scsi@2/disk@0,0:a'
       auto-boot-on-error?:  'true'
       auto-boot?:  'true'
       boot-command:  'boot'
       boot-file:  
       boot-device:  'disk0:a'

and check the bootpath and boot-device are correct

3/- system is mounted correctly so pkginfo are getting information from a correct boot disk - not meta disk suite or mirror boot disk

4/- Lastly run the truss command to see whether pkginfo get the information from after checking you have correct version installed
#truss -failed pkginfo -l VRTSvxfs

After long message , you will see

22836/1:        access("/var/sadm/pkg/.save.VRTSvxfs/pkginfo", 0) = 0
22836/1:        open("/var/sadm/pkg/.save.VRTSvxfs/pkginfo", O_RDONLY) = 3
22836/1:        fstat64(3, 0xFFBFED20)                          = 0
22836/1:        fstat64(3, 0xFFBFEBC8)                          = 0
22836/1:        ioctl(3, TCGETA, 0xFFBFECAC)                    Err#25 ENOTTY
22836/1:        read(3, " C L A S S E S = a l l  ".., 8192)     = 1340
22836/1:        read(3, 0x000F0EB4, 8192)                       = 0
22836/1:        llseek(3, 0, SEEK_CUR)                          = 1340
22836/1:        close(3)                                        = 0


It read from /var/sadm/pkg/.save.VRTSvxfs/pkginfo. Check if the directory /var/sadm/pkg/.save.<Product name>. Move the directory away from the current directory, If modinfo show correct version and you can run pkginfo now to check . If the version are matched, then the problem is resolved. Otherwise you will need to remove and reinstall product.

This ran after remove .save.VRTSvxfs without reinstall product
# pkginfo -l VRTSvxfs
  PKGINST:  VRTSvxfs
     NAME:  VERITAS File System
 CATEGORY:  system,utilities
     ARCH:  sparc
  VERSION:  4.0,REV=GA04
  BASEDIR:  /
   VENDOR:  VERITAS Software
     DESC:  Commercial File System
   PSTAMP:  VERITAS-FS-4.0.2.0-2005-06-17-4.0MP2=116689-02
 INSTDATE:  May 04 2006 13:41
  HOTLINE:  (800) 342-0652
    EMAIL:  support@veritas.com
   STATUS:  completely installed
    FILES:      233 installed pathnames
                 36 shared pathnames
                  5 linked files
                 48 directories
                 74 executables
                  5 setuid/setgid executables
              51407 blocks used (approx)