Source Nodes
This field contains the ID of the source node (also known as “parent node” or “From node”). Source nodes are nodes that precede the specific data point in the hierarchy.
For example, if you want to create a relationship between nodes A and B where the latter succeeds the former, you must define A as the source node of B.
Node IDs can be any combination of alphanumeric characters, but they cannot contain spaces.
By default, Node IDs will also be used as display names on the chart. If you wish to use custom display names for the nodes (with spaces), you can use the Source Node Label field.
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