How to pass null value to the fields

Hi Experts,

we are working on IDOC to SOAP scenario.

For the fields, which don't have the values we are populating by assign " / " in the sender side while generating the IDOC.

my requirement is to whenever the field got " / " it should display " Null " value. i mean empty value.

please help me to achieve this.

Regards

Bhargava krishna