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Propery Expression ISNA or ISERR


When concatenating varying properties, there may be the instance when some of those properties don't exist.  There needs to be a way to test for this.

E.g. Properties:

1. Wall Type (available for "Partition Wall" & "Solid Wall" classifications)

2. Core Type (available for "Solid Wall" classification)

3. Wall Code: CONCAT(Wall Type, "| ", ISERR(Core Type, ""))

Bruce Walker
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