Subtotal not correct in matrix

a119526 try this measure

SUMX(
    SUMMARIZE ( 'SAP Sales Daily', 'SAP Sales Daily'[ABRV_DESC], 'Product'[gpn]),
    VAR volLY = [Volume LY Test]
    VAR volCY = [Volume CY]
    VAR salesLY = [Sales LY test]
    VAR salesCY = [Sales CY]
    VAR priceCY = [Price CY]
    VAR priceLY = [Price LY Test]
    RETURN
    IF ( ( volLY * volCY * salesLY * salesCY ) + 0 <> 0,  volLY * ( priceCY - priceLY ) ) 
)