parts warranty check in DBM

Dear Experts,

Please convey how the parts warranty check works in SAP DBM service/warranty order.

We have created parts warranty profile with control 3. Maintained the warranty determination condition record.

Next we created a order without vehicle and assigned part warranty P1 in  in sub-screen "warranty master data". The part item is seen populated in header sub screen. We also assigned the invoice date there.

But we are clueless how is warranty checked for this part after execution of the service order (ie invoice creation).

Please help. If possible give the flow of how parts warranty check works in SAP DBM.

Thanks in advance,

Nikhil.