ATP Check issue in Background Mode

Hi All,

I am creating order using BAPI BAPI_SALESORDER_CREATEFROMDAT2. Its wroking fine. I am facing issue in ATP Check.

When i create manually order throgh VA01 ATP Check perform manually. While Background ATP Check not happn thorugh my program. Due to this issue  order Marked as Advance  . Please Let em know what need to add for Perfoming ATP Check fro using this BAPI.

Please let me know any configuration missing  for avilability check in background.

Thanks

Prabu