Consistency check

tradeAmount and tradeQuantity both filled or both empty (message 5)

Symptom

The broker rejects the order functionally (feedback statusType 0) or executes an unintended quantity.

Cause

The manual prescribes exactly one of the two; the schema does not enforce it.

Fix

Fill per transaction either an amount or a quantity; the WTP Data Lab validator tests this rule.

{ "buySellId": "buy", "tradeAmount": 250000.00, "tradeQuantity": 1000 }

{ "buySellId": "buy", "tradeAmount": 250000.00 }

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