Error occuring data source 2LIS_12_VCSCL

Hi,

I have created new sales order in BQA system. Then i checked this data source 2LIS_12_VCSCL in BQA system in update mode D(Delta). That time it is showing error. when i check in display log of this data source .

Then message shows that

"Could not determine BW release of logical system ".

When i checked this data source in RSA7 . That time it shows no entry for delta update.

For avoiding this error. In BWD system when i did "INIT WITH DATA TRANSFER" . But it is showing error.

So please help me.

Thanks

Regards