The behaviour with respect to overlaps with Standard activities is defined by a mandatory system parameter, sa_overlap_breaks_enabled with values:

Value	Description
True	No special consideration will be given by the scheduling process to avoid placing Breaks within Standard Activities, rather than in free periods or in Jobs
False	The system will make special effort to try to place Breaks in other entities than Standard Activities wherever possible, but will still place them within a Standard Activity if no other valid possibility exists.

In all cases where a Break is placed within a Standard Activity, whether or not that Standard Activity is automatically resized to take account of the Break depends on whether that Standard Activity includes travel. If the Standard Activity has no travel, it is not resized to reflect any embedded Break; if the Standard Activity has travel, then the Standard Activity will be resized to reflect the duration and positioning of any embedded Breaks.

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