Update transaction-service.adoc

#7385

modules/ROOT/pages/transaction-service.adoc

@@ -110,7 +110,9 @@ To store your Open Liberty transaction logs in an RDBMS, you can configure a ded
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-The `false` value for the `transactional` attribute specifies that the datasource is non-transactional. Transaction logs can be written to this data source, but it does not participate in transactions.
+The `false` value for the `transactional` attribute specifies that the data source is non-transactional. Transaction logs can be written to this data source, but it does not participate in transactions.
+
+When you configure a non-transactional data source to store transaction logs, you must not change the value of the `syncQueryTimeoutWithTransactionTimeout` attribute from the default, which is `false`.
 
 If you store transaction logs in an RDBMS, each server must have its own tables. You can specify a unique table suffix by using the `transactionLogDBTableSuffix` attribute for the `transaction` element. The value for this attribute is a string that is appended to the table name to make it unique to the server where the table is hosted. In the previous example, `MyServer1` is added as a suffix to any table names that are created for this server in an RDBMS.