Issues with Pivot Cache
`CT_pCDSDTCEntries` Elements are choice, so should `allow_none` `CT_Tuple` only `item` is required, rest should allow none. Spec: ``` <complexType name="CT_PCDSDTCEntries"> <choice maxOccurs="unbounded"> <element name="m" type="CT_Missing"/> <element name="n" type="CT_Number"/> <element name="e" type="CT_Error"/> <element name="s" type="CT_String"/> </choice> <attribute name="count" type="xsd:unsignedInt"/> </complexType> ``` ``` <complexType name="CT_Tuple"> <attribute name="fld" type="xsd:unsignedInt"/> <attribute name="hier" type="xsd:unsignedInt"/> <attribute name="item" type="xsd:unsignedInt" use="required"/> </complexType> ``` Sample file:[sample5.xlsx](/uploads/406f96401e8974ba8a18f5e7a6744679/sample5.xlsx) Tracking here so I don't lose it. I'll submit the merge on 3.1?
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