You tried to run a task that writes data from a flat file to a Salesforce object, but one of the external ID fields in the flat file is not found in the related Salesforce object. When this occurs, the task fails with following error:

[Salesforce object name] : Error received from salesforce.com. Fields []. Status code [INVALID_FIELD].
Message [Foreign key external ID: not found for field <field name> in entity <source object>].

The buffer [] returned from outbound message queue [] is corrupt.

Case	Suggested Action
The fields sent by the outbound message do not match the source fields used in the task.	Update the outbound message or update the task so that the fields sent by the outbound message match the source fields used in the task.
The source metadata, such as the precision or data type of a field, has changed since the task was configured.	Update the task. To refresh the source metadata in the task, on the Field Mapping page, click Refresh Fields.

Type: Tomcat, Name: InfaAgent.MaxTotalBytesQueued, Value: <large number in MB>
Type: Tomcat JRE, Name: INFA_MEMORY, Value: -Xmx<large number>
Type: Tomcat, Name: InfaAgent.OutboundMessageIdDuplicateTimePeriod, Value: <large number in milliseconds>

Type: Tomcat, Name: InfaAgent.MaxTotalBytesQueued, Value:256
Type: Tomcat JRE, Name: INFA_MEMORY, Value: -Xmx1g
Type: Tomcat, Name: InfaAgent.OutboundMessageIdDuplicateTimePeriod, Value: 60000