Leave BAdI - Error Handling

Dear Experts,

I have implemented a custom BAdI implementation for the Leave Request.

But in the method IF_EX_PT_ABS_REQ~SIMULATE_VIA_BLOP  I have copied the standard coding in the BAdi and after that I have used my custom logic inside the same.

When i am using the message handler to throw the error message it is throwing an exception.I have gone through the other threads is SDN also it seems I am using the same type of logic.

Please find the below coding.

Kindly help in identifying the error where it went wrong.

DATA:  message_handler  TYPE REF TO if_pt_req_message_handler.

CALL METHOD message_handler->add_message

     EXPORTING

       im_type   = 'E'

       im_cl     = 'ZHR_LEAVE'

       im_number = '000'

       im_par1   = 'SIMULATE_VIA_BLOP'

       im_par2   = 'IF_EX_PT_ABS_REQ~SIMULATE_VIA_BLOP'

       im_par3   = 'BLOP'

       im_context = ''

       im_subcontext = ''

       im_classname = 'CL_PT_ARQ_BLOP_ADAPTER'

       im_methodname = 'MESSAGE'.

Kindly give your suggestion

Thanks,

Nalla B.