Answered
Why can't I select fields for calculation
It only lets me "select all" or "deselect all", it won't let me select individual fields, I have done something wrong in the field formatting?

It only lets me "select all" or "deselect all", it won't let me select individual fields, I have done something wrong in the field formatting?

Use the space-bar to tick the currently selected field, or click a bit off to the center of the check-box on the left.
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