Release 10.1A: OpenEdge Data Management:
DataServer for ODBC

Transactions

With DataServer operations, an ODBC data source handles its own transaction roll back and recovery operations. However, if the ODBC driver supports transaction processing, the Progress transaction scoping rules apply: a transaction ends when the code exits the outermost block that performs an update. With the DataServer:

When a transaction that updates an ODBC data source ends successfully, Progress sends a COMMIT to the data source.
If you interrupt the transaction, Progress sends a ROLLBACK to the data source.

See the OpenEdge Development: Progress 4GL Handbook for details on how Progress handles transactions and error conditions.