# \#errata

**URL:** https://forums.buildingsmart.org/tag/errata/114.md

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## [Spatial composition mandatory levels requirements need updating for IFC4.3](https://forums.buildingsmart.org/t/spatial-composition-mandatory-levels-requirements-need-updating-for-ifc4-3/3547)

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**Author:** [@Moult](https://forums.buildingsmart.org/u/Moult)\
**Replies:** 0\
**Last updated:** [April 23, 2021, 7:28am UTC](https://forums.buildingsmart.org/t/spatial-composition-mandatory-levels-requirements-need-updating-for-ifc4-3/3547 "2021-04-23T07:28:29Z")

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This statement needs updating to accommodate the new IfcFacility. In addition, I would question the implicit mandatory requirement of an IfcBuilding. Why is it invalid to simply have an IfcSite with some civil pipes in t…