Getting an error while creating auto create po using PO_INTERFACE_S.create_documents

 HI Gurus,

I am trying to create based on requisition number(using auto create option) using PO_INTERFACE_S.CREATE_DOCUMENTS

but i am getting a error regarding the package and the error is

L_MSG_DATA=ORA-06502: PL/SQL: numeric or value error: character string buffer too small at location 100 in Package PO_INTERFACE_S Procedure create_documents

the code/wrapper i am using for this requirement is

CREATE OR REPLACE procedure APPS.xxmsn_dummy_po(p_requisition_number in number  ) is

l_interface_header_id   NUMBER;

l_interface_line_id     NUMBER;  

l_process_code          VARCHAR2 (20) := 'NEW';          

v_return_status VARCHAR2(1);