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Click on the document's reference in order to access to the validation buttons:
Validation or rejection of an order and forecast is done via the button "validate/reject" situated upper right-hand side of the window. Comments may be added in order to justify the decision, and those will be visible in both the email notification triggered upon validation/rejection and the validation on the actual document. Here below is how you validate/reject orders and forecasts:
And this is how you validate standard lists:
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