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Ali,
Under Contiguous logic if the activity has SS and FF predecessors both logic constraints will be respected as well as the requirement for the activity to be continuous. It might be that the activity is driven by a FF link until you increase its duration enough for the SS links become driving.
Under Contiguous logic either one SS or FF link is driving while duration is contiguous. Under non contiguous logic, the release of the requirement for the activity to be contiguous allows for the first split be driven by the SS links while the last split is driven by the FF links. If you increase the activity duration there will be a point activity will become contiguous and the SS link will become the driver.
The problem is that the splitting rule, if this is what you want to model, shall not be the same for all occasions, automatic splitting shall be considered non good practice, contrary to what some are requiring or advocating, including some members of the PMI and a few surviving advocates of the Activity on Arrow network representation which initially adopted the non contiguous calculation of early dates.
Best regards,
Rafael