Assembly connection has been defined with an unsupported section type. (Structure)
Meaning: Assembly connections only support the cross-section types that are found in the latest AISC set of tables. Arbitrary or cross-sections outside these types are not supported by assembly connections.
Recovery: Delete the Intergraph supplied assembly connection. Contact your catalog administrator about creating an assembly connection that supports this cross-section type modeled after the Intergraph assembly connection. The administrator must be familiar with Visual Studio coding and with customization of catalog content.