An IDoc is a hierarchical structure that contains segments. A segment can be a parent or child. A child segment depends on another segment. A parent segment contains child segments. A parent segment can be a child of another segment.
IDoc segments are organized into groups. The following rules determine the group to which a segment belongs:
A parent segment starts a new group. For example, in the MATMAS04 IDoc, the E1MARCM segment contains a child and therefore starts a group.
A child segment that is not a parent belongs to the group that is started by its immediate parent. For example, in the MATMAS04 IDoc, the E1MARA1 segment does not contain a child and therefore belongs to the group of its parent E1MARAM.
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