Insufficient memory

Good afternoon,

I ask for your help,

I have the following error:

"There is not enough memory to complete this operation."

This error comes out when integrating the following function into a table and selecting all products:

Purchase $-SUMX(SO,[Quantity_SO]*[Purchase_Cost_TOPN]) // the goal is to get a purchase amount per product. The units sold by the purchase price (average of the last 5 purchases).

Quantity sold (Quantity_SO) - SUM(SO[ITEM_COUNT]) //sum of parts sold
Average purchase price last 5 purchases (Purchase_Cost_TOPN)-IF(HASONEVALUE(Items[ITEM_ID]),AVERAGEX(CALCULATETABLE(TOPN(5,PO,PO[CREATE_DATE]),PO[ITEM_UNIT_PRICE]&>0,FILTER(ALL('Dim_Calendar DAX'[Date]),'Dim_Calendar DAX'[Date]<-MAX('Dim_Calendar DAX'[Date]))),PO[ITEM_UNIT_PRICE]))

My model is integrated with 4 tables: SO(sales), Items, PO(purchases), Calendar (dates) /annex image of my model

The granularity level of my OS and PO tables is per day.

Tables have the following rows: items (73774 rows) / OS (3,248,016 rows) / PO(561,165 rows)

The actions I have taken to avoid this error are:

-Delete columns that are not needed

-Clear cache in options>data load> Clear cache

-Increase the maximum allowed (MD) to 16000 in options>data load> maximum allowed

I'm using direct query to bring information from a netsuite odbc (ERP)

But I'm still with the same mistake 😞