add dml-transaction

1 files changed, 14 insertions, 0 deletions

diff --git a/requirements/data_models/dml-transaction.md b/requirements/data_models/dml-transaction.md
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+++ b/requirements/data_models/dml-transaction.md
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+# dml-transaction
+
+A transaction represents a real transaction, such as buying a beer or depositing
+a wage slip. It may be associated with at most one bucket.
+
+| Field        | Type    | Description                                        |
+| ------------ | ------- | -------------------------------------------------- |
+| id           | string  |                                                    |
+| amount       | number  | The amount of money involved in the transaction.   |
+| date         | date    | The calendar date when the transaction took place. |
+| counterparty | string  | The other party in the transaction.                |
+| bucket       | string? | The bucket associated with the transaction.        |
+
+Source: req-010, req-017