IDOC problem

HI

Recently our ERP team has escalated that heavy load of IDOC requests for BW in one of the source system has been created, but we are pulling regular loads to BW system, i want to know why there is heavy load of IDOC requests created in source system, can any body help in this please in finding the reason why the heavy load of IDOC will be created in the source system

Thanks

Maruthi