wie man Sortfield Primeg invertiert
sortField="userName" [sortOrder]="-1"
Stupid Sable
sortField="userName" [sortOrder]="-1"<p-table [value]="offers" sortField="totalPrice">...<p-table>
in case of data binding you need to use curly brackets []
<p-table [value]="offers" [sortField]="totalPriceValue">...<p-table>
and for you case isRelventPrice$ this will work
<p-table
[value]="offers" [sortField]="(isRelventPrice$ | async)? 'totalPrice' : 'unitPrice'">
....
</p-table>