Resolved enable or disable override condition

can you please help me how to fix a condtiotion import
i have this import

<product>

<id>8810</id>

<category>ΧΑΛΙΑ>ΧΕΙΜΕΡΙΝΑ ΧΑΛΙΑ>Μοντέρνα χαλιά</category>

<mpn>2021962401023</mpn>

<RegularPrice>239.00</RegularPrice>

<SalePrice>191.20</SalePrice>

<StockStatus>instock</StockStatus>

<Stock>1</Stock>

</product>

i want to enable override = 1 when the SalePrice has a value
i attach my template to see what i have done so far
when the saleprice field is empty is like this: <SalePrice/>
thanks in advanced