HdlsCfgSvcLoadABO not being called from workflow process manager component

Hi,

In one of the customer's environment, the defaulted product of the new promotion is not being added, product which does not exist in the new promotion is not being deleted.

After further investigation, it was found that HdlsCfgSvcLoadABO signal is not being called in the non-working environment, However when the process is run through the Business Service Simulator of the Object Manger component, this signals gets triggered.

The question is why this signal is being called if the custoemr simulates it using BS Simulator (eCommunications Component), but it's not being called if it's triggered using Workflow Process Manager component, in the same environment?