I have a data page, with three items I click on product, populate a field with the cost per item, add add the number of units, then have calculated field of # of units * cost per unit. It works fine, but I have another calculating field to add the 3 items for a total cost. The only time the total cost works is when I complete all three items. I assume some kind of a null value is causing the problem. Any ideas who to solve this calculation?

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## senicholas

I have a data page, with three items I click on product, populate a field with the cost per item, add add the number of units, then have calculated field of # of units * cost per unit. It works fine, but I have another calculating field to add the 3 items for a total cost. The only time the total cost works is when I complete all three items. I assume some kind of a null value is causing the problem. Any ideas who to solve this calculation?

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