Veritas volume manager resize

Hiii,

Can any one sugge me best practices for resizing a veritas voulume with vxfs file system?

I tried doing this

vxassist -g stg shrinkto stgvol 209715200

VxVM vxassist ERROR V-5-1-7236 Shrinking a FSGEN or RAID5 usage type volume can result in loss of data. It is recommended to use the "vxresize" command or specify "-f" option to force the operation.

I was using veritas 5.0 for Solaris 10

Thank you

you can examine more examples for different methods from below url

Volume Lesson 5: Volume resizing