This dialog allows you to edit values for multiple validity periods.
 
                                                            Figure: Validity-Related Values for Manufacturing Cost Rate dialog
Each row corresponds to a validity period.
- 
                                                                "Valid From" column: The start of the period in which the activity is available. 
- 
                                                                "Valid To" column: The end of the period in which the activity is available. 
- 
                                                                "Value" column: Enter a valid value. 
- 
                                                                "Delete all" button: Click it to delete all entries.