Currently, some elements (Walls, Framing, Columns, & Floors) have a "Structural Material" property while others (Slab Edges) have a "Material" property. Due to the limitations in Filters (& Schedules), this can cause problems. See also make ALL fields accessible in multi-category filters (not just common fields).
EDIT: and the similar/related idea: Use the same Weight Per Foot parameter across all OTB structural steel families.
