Calculated and editable textbox (1 Viewer)

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I have a form bound to a table, with a subform in there, and I have a textbox with a source one of the table's fields. I would like the value of this textbox to be calculated based on the values of some boxes in the subform, but I also wont to be able to edit the value on the textbox myself.

Is it possible to have a textbox that get its value both from calucaltions and user input?

 

[pbaldy]

You could use the second method here:

http://allenbrowne.com/casu-14.html