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paired-reversal-cancellation

Reference for paired-reversal handling on GL batch tapes: an RV row whose ref-trace points at an earlier row cancels BOTH legs (the RV and the row it references) — but ONLY when the two value-dates fall within the shop's reversal settlement window; an RV that references a too-old posting is NOT a cancellation and posts one-sided. Useful when the posting tape carries a reference-trace column alongside reversal codes and the running balance is off by twice the reversal magnitude, or by a whole leg on stale references.

tasks-extra/cobol-gl-batch-reconcile/environment/skills/paired-reversal-cancellation/SKILL.md

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# Paired reversal cancellation

GL batch tapes that support corrections distinguish two reversal flavors:

| Flavor       | Shape on tape                          | Effect on balance                                                            |
|--------------|----------------------------------------|------------------------------------------------------------------------------|
| Unpaired RV  | `RV` row, ref-trace blank              | Posts via the standard RV rule for the account type (e.g. sign-flip on a deposit). |
| Paired RV    | `RV` row, ref-trace = an earlier trace, **within the reversal window** | The RV row AND the row it references are BOTH suppressed; both reported as `CANCEL` rejects; net delta to the balance is zero. |

The intent of a paired RV is "this earlier posting was a mistake — erase
it entirely." If only the RV is suppressed, the original still posts and
the running balance ends up off by `2 × magnitude` (the unwanted original
plus the absence of the reversal that would have offset it).