Input formula won't evaluate

I am trying to get a simple arithmetic formula to update on the data card.  According to PDM help, I should be able to evaluate \$Add(11.2,3).  But nothing shows up in the Edit box on the data card.

The only flags that have been set are, "Show in Explorer"  All other flags are turned off.

Any advice would be appreciated.

Thanks,

-Kristan

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