The reason is that on the "Project Performance" (graph) we exclude assignments from placeholders that are in the past.
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In the Actual vs Schedule, include the assignments related to this placeholder even when in the past.
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The specific reasons for this was considering each independently, we thought:
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​In project performance - any placeholder who didn't have the work occur should be excluded from the totals (since by definition no one actually did the work)
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​In Actual vs Scheduled - any placeholder who didn't have work occur, should still be compared as part of the 'original plan'.
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