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Entries may name several parties, each with an exact amount, a percent, or a share derived from the members' capital lines or [[company.members]] shares (entry.parties_set); shares always sum exactly. The 1099 worksheet counts a vendor's share. A member's party page is their partner capital statement, from the same ledger_core::k1 source as the CPA package. books.set_tin stores any party's TIN (members' SSNs for K-1s) in the vault (party.tin_set, last four in the books). The CPA package carries a K-1 member worksheet (k1-members.csv, with a members' total that ties to Schedule L) and the 1099 worksheet with full TINs, saved outside the books only. files_jointly_with notes spouses' two K-1s land on one 1040. Adversarial review fixes: reversed contributions no longer inflate K-1 contributions and distributions; a K-1 row never takes another party's TIN; TIN detection covers dot/slash/dash separators; refusals redact TINs; vendor tagging can't silently replace shared parties; reversals follow re-apportioning. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GWVo7x3UHw5kwCUaWxiejX