Need Help - PowerBI Measure

Peter_Ronaldon , Try updated measure

Price Impact =
VAR LY_Sales = [EXTENDED PRICE SPLY]
VAR CY_Sales = [Extended Price CY]
VAR LY_Quantity = [BASE QUANTITY SPLY]
VAR CY_Quantity = [Base Quantity CY]
VAR LY_Price_Per_Unit = [LY_Price_Per_Unit]
VAR CY_Price_Per_Unit = [CY_Price_Per_Unit]

RETURN
IF(
ISBLANK(CY_Quantity),
0,
IF(
ISBLANK(LY_Sales) && ISBLANK(CY_Sales),
0,
IF(
ISBLANK(LY_Sales) || LY_Quantity = 0,
IF(
NOT ISBLANK(CY_Price_Per_Unit),
CY_Price_Per_Unit * LY_Quantity,
0
),
IF(
ISBLANK(CY_Sales) || CY_Quantity = 0,
IF(
NOT ISBLANK(LY_Price_Per_Unit),
LY_Price_Per_Unit * LY_Quantity,
0
),
(CY_Price_Per_Unit - LY_Price_Per_Unit) * LY_Quantity
)
)
)
)