You can use an expression of the form .property=some_value only within a WITH ... ENDWITH construct.

• This error might also occur if you are using .NULL. as an expression.
  
  Put quotes around the .NULL. to keep it from being identified as a property.
  
  
• You might have forgotten an ending period with a value such as true (.T.), false (.F.) or a null value (.NULL.)
  
  Check for matching periods on either side of the constant.
  
  

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