Workflow event executed always in central instance

Hi,

We have created a workflow event, Z49CRSHIPTO, for BOR Object type KNA1. This event has linkage activated and it calls the RFC enabled function module Z_49_EVT_RC_CUSTOMER. The definition in SWE2 or in SWETYPV are quite similar for all events.

The problem is that this function module is always executed in central instance. Other events are balanced in different application servers and never run on central instance.

How can we correct this problem ? We don't know where is specified in which server must be executed the function modules.

Regards,

Joan