Multiple Tables as Input to BAPI

Hello

Am trying to implement search help for 3 different fields (Plant, Shipping Condition, and SCAC Code) in my model. I have created a data service for these in SAP R/3 and am populating these in 3 different tables in the model. All the tables are tied to an event and when it is triggered all the selected table rows is sent to the BAPI. All the data is sent to the BAPI but, it is sent 3 times once for every field when the event is triggered causing blanking out the returned dataset when the event is triggered second and third time (the system is triggering the second and third time automatically). Is there a way we can avoid triggering the event for every single field and send all the data only once, if so would appreciate any help in this regard.

Thanks

Sunil Achyut