POST /v2/transactions — private-market-fund-distribution-transaction

A distribution received from a private-market fund. `category`
identifies the kind of distribution; the `affects*` flags control
which derived metrics this cash flow contributes to.

Request:
{
  "data": {
    "type": "private-market-fund-distribution-transaction",
    "attributes": {
      "category":            "string (required) — one of: distribution, capital-gain, dividend, return-of-capital, interest-received, carried-interest, withholding-tax",
      "amount":              "number (required) — distributed amount, in fund currency. Positive (negative allowed for corrections)",
      "recallableAmount":    "number (required) — portion of `amount` that is recallable. 0 = non-recallable; equal to `amount` = fully recallable",
      "affectsEstimatedNav": "boolean (required) — whether this hits the instrument's estimated NAV at the date",
      "affectsMultiples":    "boolean (required) — include in TVPI/DPI/RVPI multiples (recommended: true)",
      "affectsIrr":          "boolean (required) — include in IRR (recommended: true)",
      "affectsCostBase":     "boolean (required) — adjust the investor's cost basis (recommended: true)",
      "accountAmount":       "number (required) — amount deposited/withdrawn, in account currency",
      "comment":             "string (optional)",
      "tradeDate":           "string, ISO 8601 (required)",
      "valueDate":           "string, ISO 8601 (required)"
    },
    "relationships": {
      "account":    { "data": { "type": "account", "id": "string (required)" } },
      "instrument": { "data": { "type": "instrument", "id": "string (required) — the fund instrument" } }
    }
  }
}

Response (201 Created):
{
  "data": {
    "id": "string",
    "type": "private-market-fund-distribution-transaction",
    "attributes": { /* same as request */ },
    "relationships": { /* same as request */ }
  }
}