Keep only units that differ from their data-derived default

Change detection is value-based: a row is considered "changed" when its target unit (PPSTRESU) differs from the original unit (PPORRESU). This replaces the previous default flag, which only tracked edits made through the Units modal and missed automatic changes such as volume simplification.

Usage

changed_units(units)

Arguments

units

A units table with PPORRESU and PPSTRESU columns.

Value

The subset of rows where PPSTRESU differs from PPORRESU. Rows where either unit is NA are excluded to avoid emitting NA-based entries downstream.