Tying to add a custom property to excel rows. My code seems to be correctly adding the xml as below.
< x:customPr xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" name="MyCustomProp" r:id="PropId" />
And I've added a CustomPropertyPart with the property value and and Id="PropId". Despite CustomProperty being ECMA supported Excel 2010 removes the customproperty on savingas and in the productivity tool it reflects as an upsupported element:
OpenXmlUnknownElement openXmlUnknownElement1 = OpenXmlUnknownElement.CreateOpenXmlUnknownElement("<x:customProperties...
Is this expected behaviour? Is there another way I can persist a property on rows without excel deleting the data on saveas?
Thanks in advance?