Business Area field to be sent blank

Hi,

I have an Outbound IDOC for cost centre. Outbound is successful, but if business area that is CSKS-GSBER field if blank from SAP end, at the receiver end it shows ZEROES (numeric) instead of blank.

How to handle this, is it some system settings? because I checked the FM and the FM sends blank.

Thanks,

Aditya V