C.31.RSA:4.4 - Pseudo-sum boundary

An explanatory decomposition may be useful:

total-described-structure under accountingBasisRef:
  reusable slots
  bespoke residue slots
  hidden or residual uncertainty slots

This is a readable decomposition of one declared accounting description, not an equation defining an architecture amount. If the slots do not share a declared accounting basis and comparability rule, they cannot be summed or ranked.