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LocaleIdentifier error on occurs drillthrough
It appears that in situations where the Windows regional setting doesn't match the Excel UI language, and when the OLAP PivotTable Extensions add-in is enabled, when you double click a measure to try to perform a drillthrough, the following error message is received and drillthrough fails:
"XML for Analysis parser: The LocaleIdentifier property is not overwritable and cannot be assigned a new value."
A fix is in the works for this issue. Please post a comment if you are encountering this issue in the meantime.