After updating SLES11-SP1 no longer able to login - displays "error in service module"

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Environment

SUSE Linux Enterprise Server 11 Service Pack 1

Situation

After updating SLES11 - SP1 when attempting to login, the message: "error in service module" is displayed and login is not allowed

Resolution

Reboot server.
At boot parameters add number 3 to boot into multi-user mode.
Login as root user.
Backrev the pam-module package:

zypper in pam-modules-11-1.6.15
Select Option 1 to downgrade

To return to GUI, issue command:

init 5 && exit

Additional Information

Reported to Engineering

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