Burst
The burst concept deals with the scope of the data that is processed in one run of the map. ACH Envelope service example maps are set to execute in burst mode.
The ACH Envelope service runs a portion of the input with each iteration of the map. This is expected behavior in several IBM Sterling B2B Integrator services.
In the ACH Envelope service example, in the map input card, the FetchAs property is set to Burst, with a FetchUnit of 1. This allows the Transformation Extender map to generate data audit information that can be used by the ACH.