When I run the MA, it stalls and hangs on a long running BAPI.

Retuning large amounts of data in one BAPI call poses the risk of the BAPI timing out and causing unexpected behavior, such as a hang, or a stopped-extensible-exception after several hours and no import .This is sometimes the case for BAPI_EMPLOYEE_GETDATA used to retrieve multiple employee information in one call.

For these BAPIs, pagination retrieval must be configured so that data may be retrieved in smaller chunks. See How To Configure Paginated Imports for details on how to set this up.