How You Lock Cells While Editing Measure Data or Allocating Values in a Table
When you are working in a Supply Chain Planning work area, you might be editing measure data in a table.
When you have locked cells, edits, including those that spread allocations to other cells, do not change locked cells.
Note: 
         
      You must configure at least one summary to enable the Lock and Unlock actions.
Lock cells by performing one of the following:
- 
            Click the Lock action in the Actions menu. 
- 
            Click the Lock icon on the table toolbar. 
- 
            Right-click in an editable cell.