2.1.770 Part 1 Section 18.10.1.49, location (PivotTable Location)
a. The standard does not bound the maximum allowed value on the firstHeaderRow attribute.
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Office bounds the maximum allowed value of firstHeaderRow by the value of firstDataRow.
b. The standard says the @ref specifies the first row of the PivotTable.
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Office assumes that @ref specifies the range of the PivotTable excluding the page fields.