Except from Practical Guide to SAP Material Ledger by Rosana Fonseca.
The material price determination indicates how the valuation of a material should occur after each business transaction for a material relevant for valuation. If SAP Material Ledger is active, this field has to be set up in the material master using an appropriate combination of price control and material price determination. If SAP Material Ledger is activated for a valuation area, the accounting 1 view looks slightly different than the regular screen without a material ledger. Additional fields become available when using SAP Material Ledger or split valuation.