G/L account determination for account assignment object for third party orders

Hi All,

I would like to understand how the G/L account determination  would happen for Account assignment object ( category - X) and item category "S" for third party orders. the material is non stock material (NLAG) as maintained in material master with some valuation class as "8013"(for eg).

Kindly share the configuration details of how the G/L account determination would happen in PO for third party orders which vendor would deliver  the goods directly to customer.

Please share the relevant helpful standard documents with respect to G/L account determination and cost center determination for account assignment objects and stock orders as well.

Regards

Sudhan