| Tag | Field Name | XML Name | Data Type | Union Datatype | Description | Added | Depr. | Enums from tag |
|---|---|---|---|---|---|---|---|---|
| 206 | OptAttribute | @OptAt | char |
Provided to support versioning of option contracts as a result of corporate actions or events. Use of this field is defined by counterparty agreement or market conventions. | Added FIX.4.1 |
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