Only one property per module can bind to DataField.  Property 'item' already binds to it.  Selecting this attribute will void the previous setting.

You tried to set the Data Binding attribute of a property to bind to DataField, but another property has this attribute set. This can occur in the Procedure Attributes dialog box.

Only one property in a module is allowed to bind to DataField. Click OK to set the current property to bind to DataField or click Cancel to void the change.