Damaged relations are shown in red. To make relations of an operation valid again, they can be revalidated. The set minimum delay, the set maximum delay and the set type of relation between operations can be restored by moving the operation(s).
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Choose in the Navigation Pane.
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Select the planning cell.
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Choose the tab Planning.
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Right-click the operation to which a relation must be assigned.
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Choose Revalidate Relations in the shortcut menu.
All the relations to this operation are revalidated by moving the operations that are dependent on these relations.
