Advanced condition "Is not empty" does not validate correctly

Symptoms

[TTMSB-BPM] View Validation Error
 

Diagnoses

Advanced condition "Is not empty" does not validate correctly against a decimal/number-type textbox control when the value is empty
 

Resolution

This has been logged for further investigation. The current workaround is to use the 'Text' property of the Textbox control (Control > Detail > Text)