This project default specifies whether only one master node without a parent on the BOM is allowed or not.
The master node and root node can be used synonymously here. You would use only one master node when your whole project is organized below one single node. If you intend to have discipline as the top node, you need more than one master node.
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Module(s) affected by this setting: Maintain BOM, Position Details, Advanced Search, Search Results, Procedures/Macros, and BOM Procedures/Macros Logs.
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List of Values: Y and N (default).