Error 136 Functions that can be compossed must declare a return type

Hello,
I have downloaded the EF Final Release driver and Im working with Oracle 11g express.
I have the following Procedure:
PROCEDURE ProductosPedido(
Datos Out SYS_RefCursor) IS
BEGIN
OPEN Datos FOR
SELECT Nombre,
TO_NUMBER(Precio * (SELECT SUM(unidades)
FROM DETALLES_PEDIDO
WHERE PRODUCTO = PRODUCTO.ID)) Importe
FROM PRODUCTO;
END;
And the following config section:
<oracle.dataaccess.client>
<settings>
<add name="System.Productospedido.RefCursor.Datos" value="implicitRefCursor bindinfo='mode=Output'"/>
<add name="System.Productospedido.RefCursorMetaData.Datos.Column.0" value="implicitRefCursor metadata='ColumnName=Nombre;BaseColumnName=Nombre;BaseSchemaName=System;BaseTableName=Producto;NativeDataType=nvarchar2;ProviderType=NVarchar2;DataType=System.String;ColumnSize=50;AllowDBNull=true;IsKey=false'" />
<add name="System.Productospedido.RefCursorMetaData.Datos.Column.1" value="implicitRefCursor metadata='ColumnName=Importe;NativeDataType=number;ProviderType=Decimal;DataType=System.Decimal;AllowDBNull=false;IsKey=false;ColumnSize=8'" />
</settings>
</oracle.dataaccess.client>
I have imported succesfully in my EF Model, but when I try to consume the Procedure it gives me Error 136 Functions that can be compossed must declare a return type
Any solutions?
Thanks and best regards!

A stored procedure does not have a ReturnType, therefore IsComposable="false" and it cannot be used in LINQ queries.
This limitation is imposed by EF and not by ODP.
You may want to create a stored function which has a ReturnType ref cursor, and include this stored function into your model. Then, under the same namespace, you create a class with a "stub" method/function and use EdmFunction() to map this stub to the stored function. For example,
class myFuncClass
[EdmFunction("Model.Store", "MY_STORED_FUNC_1")]
public static <your_complex_type_or_DbDataRecord> MyFunc_1(int? column1, ...)
throw new NotSupportedException("Direct calls are not supported");
You should be able to call myFuncClass.MyFunc_1(x) in your LINQ query. Your stored function MY_STORED_FUNC_1 will be called in the generated query.

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