In versions of LabVIEW later than 8.6, there is a VI available to use specifically for this purpose. You can find the Set Shunt Calibration (Scan Interface) VI located at:
<LabVIEW>\examples\CompactRIO\Shared\Set Shunt Calibration (Scan Interface).vi
Use a Property Node for the Module you are using and set Property: Enable Shunt Calibration to True. If needed, expand the node down to Enable Shunt Calibration on multiple channels.
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