Deposit #1560 seated the Pessoa corpus with the orthonym withheld, and gave a reason: that seating Fernando Pessoa's own pages alongside the three heteronyms would foreclose the leave-one-out test the archive intends to run. This erratum withdraws that reasoning and seats the orthonym.
The reasoning was wrong in a way worth stating precisely, because the error is a general one. A leave-one-out test withholds a voice and asks whether the structure of the remaining voices implies it. Withholding at seat time appears to protect that test and in fact destroys its validation. With three voices seated, holding one out leaves two, and two points cannot triangulate a third. More seriously, it yields a single fold where the design requires four, and it removes the only check that matters: whether the procedure also recovers a voice nobody regards as special. A method that succeeds on Caeiro and has never been tried on Reis or Campos has told us something about Caeiro, not about method.
The hold-out is therefore analytical, not archival. All four voices are seated, and each is withheld in turn at analysis time — 123 Caeiro, 60 Reis, 107 Campos, and 493 of the 496 pages listed under the orthonym's category. Three did not resolve and their absence is stated in the seat rather than closed over.
One thing the seating exposes that the withholding had hidden. Under Pessoa's own usage the orthonym is the position bearing the civil name, which is Pessoa-himself. Under the functional definition the archive works with, the orthonym is whichever position bears the project's founding gesture — and in this configuration that is arguably Caeiro, the master the other voices acknowledge and organise themselves around. The two definitions do not pick out the same voice here. The seat records both readings and settles neither, because which position is the orthonym is exactly what an instrument would have to determine rather than assume.
The canonical bytes of #1560 are unchanged. The correction is registry-level and its target is declared in related_deposits, which is the form the archive's errata surface was built to make possible and which most of its earlier errata do not yet use.