Adding the Message in Application Log

Hi,

I am trying to insert the data in the application log (SLG1), Where i am able to update the details in the Application Log using the Function module "BAL_LOG_MSG_ADD". Its even displaying the message.

I am not able to add one more column in the Message log - i.e. I need to add PERNR in the column, how can i do it. Kindly advice.

Thanks

Yogesh