getYear() function not allowed in criteria - what's the alternative?

In my form1 I have a dateField and salePriceField. In my form2 I have a yearField and totalSalesField.

I'm trying to insert records into form2 like below, but getting the "not allowed in left side of criteria error.

dateList = form1[ID !=0].distinct(dateField);

for each saleDate in dateList

{

anualSales = form1[dateField.toYear() = saleDate.toYear()].sum();

x = insert into form2

[

yearField=saleDate.toYear()

totalSalesField=anualSales

etc....

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