'Querying Dynamics 365 for all salesorderdetails associated with a particular salesorder

I'm trying to get all salesorderdetails associated with a particular salesorder by sending a GET request to the following path:

$"{orgname}/api/data/v9.1/salesorderdetails?$select=salesorderdetailid&$filter=contains(salesorderid,'{salesOrderId}')";

where salesOrderId is a sales order GUID as a string in Dynamics 365. I get the error No function signature for the function with name 'contains' matches the specified arguments. The function signatures considered are: contains(Edm.String Nullable=true, Edm.String Nullable=true).

Is this just not the way to go about getting those associated salesorderdetails?



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