Describes the cause and action for error messages.
Error Message(English)：
pivot do not count duplicates
Unique Count
https://www.contextures.com/pivottablecountunique.html#unique
Introduction
https://www.contextures.com/pivottablecountunique.html#intro
Add to Data Model ...
https://www.contextures.com/pivottablecountunique.html#data
Pivot the Pivot - Excel 2010
https://www.contextures.com/pivottablecountunique.html#pivot
How to count unique values in pivot table? - ExtendOffice
https://www.extendoffice.com/documents/excel/2127-excel-pivot-table-count-unique-values.html
Simple Pivot Table to Count Unique Values - Stack Overflow
https://stackoverflow.com/questions/11876238/simple-pivot-table-to-count-unique-values
Pivot table when same record appears multiple times
https://stackoverflow.com/questions/48080162/pivot-table-when-same-record-appears-multiple-times
Excel- Count duplicate values in multiple columns using pivot ...
https://stackoverflow.com/questions/45713480/excel-count-duplicate-values-in-multiple-columns-using-・・・
Avoiding duplicate rows in an EXCEL Pivot Table
https://stackoverflow.com/questions/25603305/avoiding-duplicate-rows-in-an-excel-pivot-table