[csw-users] unable to install pkg in a sparse zone

[Gerard Henry]

hello all,

on old sparc Solaris 10 with sparse zones, i'm trying to install CSW 
packages, but it fails:
pkgadd: ERROR: unable to create unique temporary file 
</usr/sadm/install/scripts/i.cswpreserveconfgoaORc>: (30) Read-only file 
system
ERROR: content verification of 
</usr/sadm/install/scripts/i.cswpreserveconf> failed
     unable to fix modification time
     file size <2841> expected <2654> actual
     file cksum <32180> expected <17727> actual

Installation of <CSWcas-preserveconf> partially failed.
Exiting pkgutil due to pkgadd error: 2

i don't understand why CW needs write access in /usr
Is there a workaround?
into zone, pkgutil is 2.6.5

thankds in advance for help

gerard