DAX IF condition help

Hi,

I have three variables called:

Append Sales Invoices[Amount] = Type Decimal Number

Append Sales Invoices[Header.No] = Type Text

Append Sales Invoices[Quantity] Type Decimal Number

I am trying to customize a column called TSIP Hours where the output is basically Append Sales Invoices[Quantity] that goes through an IF condition.

When the Append Sales Invoices[Amount] is 0 and Append Sales Invoices[Header.No] is either "20144" or "20140" then Output is the Append Sales Invoices[Quantity]. I put the formula down below. The problem is, it's populating the quantity regardless of the If condition - so if the quantity is 1 or greater, it still populates where it should only populate when Amount is 0.