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.
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"Valid From" column: The start of the period in which the activity is available.
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"Valid To" column: The end of the period in which the activity is available.
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"Value" column: Enter a valid value.
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"Delete all" button: Click it to delete all entries.