After "Engineers", this approach was reinforced. For example, Section 109, regarding inconsistency between Commonwealth and State laws, was broadly interpreted. Commonwealth law prevails not only where inconsistent obligations are imposed, but where Commonwealth legislation evinces an intention to "cover the field" by being the whole law on a particular subject. The Commonwealth can "manufacture" inconsistency by expressly stating that its legislation is intended to cover the field. However, an issue that was raised, without being conclusively resolved, in the Workplace Relations Challenge was whether the Commonwealth can "clear the field" by stating an intention that State laws are not to apply even if the Commonwealth does not enact other laws in their place.