Vertex of the associated node
Identifier of the associated tube material
Note: This function is intended to be used for nodes where exactly one tube material can be associated. This is the case for nodes of WorkStepType tube, tubeCutting and nodes that are part of articles where the article holds at least one node where the node's WorkStepType is one of the previously mentioned WorkStepTypes.
Note: This function throws if there is not excatly one associated tube material.
Get identifier of associated tube material