If checked the Sum row values, totals the numerical value of all data in the column.
If the value of the property includes characters (i.e. not a just a number), there will be errors when creating a BOM through Analysis & Reports > General > BOM Generator.
In Designer, open Analysis & Reports > General > BOM Generator, Click on Columns, check every property and ensure the checkbox Sum row values is unchecked for non-essential properties of non-real numbers.
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Part Lister's Sum row values issues an error when any of the values contain characters instead of numbers