Starting at TL6 customers trying to print will get error

    0781-094.  New privileges were added that need to be              
    included so that printing can work normally.                      
                                                                      
    This can occur on AIX printing subsystem or System V              
    printing subsystem.                                               
    The system V error will be similar to this:                       
    your request for <printer name> while printing on                 
    printer is read only                               

This problem is not still solved: APAR is created for the issue but status is OPEN. IZ96540: 0781-167 ENQ: CAN NOT SET PROCESS CREDENTIALS ⇒ Satus : OPEN …

But it can be fix with following commands (only possible on stopped WPAR):

# stopwpar <wparname>                                                              
# chwpar -S privs+=PV_DOM_SELF <wparname>                               
# startwpar <wparname>                                                            

Modification can be checked with command: lswpar -S

An entry is added to /etc/wpars/<wpar_name>.cf

....
    privs = "PV_AU_,PV_AU_ADD,PV_AU_ADMIN,PV_AU_READ,PV_AU_WRITE,PV_AU_PROC,PV_AZ_ADMIN,PV_AZ_READ,PV_AZ_ROOT,PV_AZ_CHECK,PV_DAC_,PV_DAC_R,PV_DAC_W,
PV_DAC_X,PV_DAC_O,PV_DAC_UID,PV_DAC_GID,PV_DAC_RID,PV_PROBEVUE_TRC_USER,PV_PROBEVUE_TRC_USER_SELF,PV_FS_MOUNT,PV_FS_MKNOD,PV_FS_CHOWN,
PV_FS_QUOTA,PV_FS_LINKDIR,PV_FS_CNTL,PV_FS_CHROOT,PV_FS_PDMODE,PV_PROC_PRIO,PV_PROC_CORE,PV_PROC_RAC,PV_PROC_ENV,PV_PROC_CKPT,
PV_PROC_CRED,PV_PROC_SIG,PV_PROC_PRIV,PV_PROC_TIMER,PV_PROC_RTCLK,PV_PROC_VARS,PV_PROC_PDMODE,PV_TCB,PV_TP,PV_TP_SET,PV_KER_ACCT,
PV_KER_DR,PV_KER_RAC,PV_KER_EWLM,PV_KER_REBOOT,PV_KER_LVM,PV_KER_NFS,PV_KER_CONF,PV_KER_EXTCONF,PV_KER_IPC,PV_KER_IPC_R,PV_KER_IPC_W,
PV_KER_IPC_O,PV_KER_SECCONFIG,PV_KER_RAS_ERR,PV_DEV_CONFIG,PV_DEV_QUERY,PV_SU_UID,PV_NET_PORT,PV_MIC,PV_MIC_CL,PV_LAB_,PV_LAB_CL,
PV_LAB_CLTL,PV_LAB_LEF,PV_LAB_SLDG,PV_LAB_SLDG_STR,PV_LAB_SL_FILE,PV_LAB_SL_PROC,PV_LAB_SL_SELF,PV_LAB_SLUG,PV_LAB_SLUG_STR,PV_LAB_TL,
PV_MAC_,PV_MAC_CL,PV_MAC_R,PV_MAC_R_CL,PV_MAC_R_STR,PV_MAC_R_PROC,PV_MAC_W,PV_MAC_W_CL,PV_MAC_W_DN,PV_MAC_W_UP,PV_MAC_W_PROC,
PV_MAC_OVRRD,PV_DOM_SELF"
....