Error when performing a multiplication on a calculated measure in OTBI

Summary:

Hello,

When trying to perform multiplication on a calculated measurement of the items in the image, An error occurs that I have not been able to resolve.

Content (please ensure you mask any confidential information):

These are the 2 fields i want to multiply:

I tried three different ways:

"Purchase Order"."Purchase Price"*"Purchase Order Measures"."Ordered Quantity"

CAST("Purchase Order"."Purchase Price" AS NUMBER) * CAST("Purchase Order Measures"."Ordered Quantity" AS NUMBER)

SUM("Purchase Order"."Purchase Price") * SUM("Purchase Order Measures"."Ordered Quantity")

What is the correct way to calculate this type of data?

I need a column that contains the multiplication of the two data