While importing the arguments of the data validation rule, the formula is treated as text and its separators are replaced with the list separator defined in the current culture. This leads to an invalid formula treated as a list of strings.

Filter Selection dialog appears on the screen. 

Workaround: Open the file with Excel and save it as a new document.

Currently, the worksheet of the shape and the collection it belongs to should be the same. Make it possible for the ChartShape and the data source to be on different worksheets.

RadSpreadsheetProcessing does not support chart color customization apart from selecting the color of the outline (set by Series.Outline.Fill). You cannot set the color of the fill of column charts etc.

Currently, row/column groups cannot be collapsed/expanded through the public API. User should be able to specify row's/column's "collapsed" attribute indicating whether the outlining is in a collapsed state.

Removing/adding rows/columns inside a worksheet requires all the data after them to be translated according to the change. This operation is slow and affects editing performance.

Currently, the chart lines support only solid fill for their outlines.

The API should be able to provide a way to move the X-axis away from the 0 value on the Y-axis or to the bottom of the chart when there are negative Y-axis values.

In Excel this can be achieved by right click on the axis, then from the context menu select "Format Axis".  Go to the "Labels" group and then in the "Label position" field select the desired value.

The COUNTIFS function returns the count of cells that meet one or more criteria.

Sometimes the customers need to obtain the result of a formula without adding it as a value to a specific cell.

Provide an API used to recalculate all formulas in the document similar to the Excel Interop Calculate function

Exporting empty workbook without any worksheet is not allowed according to the specification and such documents cannot be opened in Excel. Ensure the customers cannot create such documents using the API of SpreadProcessing.

The AlternateContent element is used to store content which is not defined by the specification.

If the lookup_value parameter and lookup_vector parameters refer cells containing text values, the function returns a Not available error ("#N/A").

ArgumentException is thrown when importing documents containing empty values

The value formula =Round(1.015, 2) returns 1.01 which is incorrect. Excel returns 1.02.

Add support for Point Markes customization options for the Charts.

Add support for Hidden and Empty Cells options:

https://support.office.com/en-us/article/display-empty-cells-null-n-a-values-and-hidden-worksheet-data-in-a-chart-a1ee6f0c-192f-4248-abeb-9ca49cb92274

The data validation rule should have values for formula1 and formula2 elements, which define the start and end values for a range to validate between. When such values are missing, a NullReferenceException is thrown on import and the document cannot be imported.

Details:

When the worksheet contains fraction numbers with fractional parts > 0.5 and < 0.5 and both these numbers have fraction format applied, the number with fractional part < 0.5 will have incorrect whole part.