Updating Cells (XMLA)
You can use the UpdateCells command to change the value of one or more cells in a cube enabled for cube writeback. Microsoft SQL Server Analysis Services stores the updated information in a separate writeback table for each partition that contains cells to be updated.
The Cell property of the UpdateCells command contains the cells to be updated. You identify each cell in the Cell property using that cell's ordinal number. Conceptually, Analysis Services numbers cells in a cube as if the cube were a p-dimensional array, where p is the number of axes. Cells are addressed in row-major order. The following illustration shows the formula for calculating the ordinal number of a cell.