Invalid Business Process ID Error while creating Service Request

Hi,

When I run the API for creating service request the error encountered is

API Programming Error (CS_ServiceRequest_PVT.Create_ServiceRequest): The value "" for parameter business_process_id is invalid.

CREATE OR REPLACE procedure APPS.xxsrload as

lx_msg_count NUMBER;

lx_msg_data VARCHAR2(2000);

lx_request_id NUMBER;

lx_request_number VARCHAR2(50);

lx_interaction_id NUMBER;

lx_workflow_process_id NUMBER;

lx_msg_index_out NUMBER;

lx_return_status VARCHAR2(1);

l_service_request_rec CS_ServiceRequest_PUB.service_request_rec_type;

l_notes_table CS_SERVICEREQUEST_PUB.notes_table;

l_contacts_tab CS_SERVICEREQUEST_PUB.contacts_table;

begin