1. Total Quantity = SUMX(FactPurchase[ordered quantity])
2. Total Purchases = SUMX(FactPurchase,[Ordered Quantity]*RELATED(DimStock[Unit Price]))
3. Total POS = COUNT(FactPurchase[Supplier Key])
4. TOTAL FINAL PO =
CALCULATE (
SUMX ( FactSales, FactSales[Quantity] * FactSales[Unit Price] ),
FILTER ( FactTransaction, FactTransaction[Is Finalized] = "true" )
)