Multiplying two decimals in ABAP CDS View

Hi,

in the select list of an ABAP CDS view I am trying to multiply to decimal values ( price * quantity ) - this leads to the error message:

Maximum accuracy 31 as DEC exceeded by an arithmetic expression

I tried to cast price and quantity to FLTP before the multiplication. At design time I'm getting warnings (Decimal places are corrected to 16), but the view wouldn't acitvate.

How can I perform a simple multiplication of two decimal fields? I am on ABAP 7.4 SP12.

Thanks,

Marek