Hello,
As per the standard SAP when you reschedule the collective system does not reschedule the child order it is explain in OSS note 152319 and 150007
If a collective order scheduling is executed for an order associated with the collective order, the system only schedules the subnetwork defined by this order. Higher-level orders are not scheduled. Here, the basic dates of lower-level orders are determined by the requirements dates of the directly manufactured component.
If adjust basic dates" is selected, the basic dates of lower-level orders are adjusted, if necessary.
Best Regards,
R.Brahmankar
