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OData WebApi over Linq2Db

See original GitHub issue

I write web-service worked by OData protocol. As data access layer using L2DB. If odata query include expand option, the result expression throw error: Multiple queries are not allowed. Set the 'LinqToDB.Common.Configuration.Linq.AllowMultipleQuery' flag to 'true' to allow multiple queries.

Executable query:

db.GetTable<Department>()
                .Select(Param_0 => new SelectAllAndExpand()
                {
                    ModelID = "2cd45fee-a6aa-4d0e-9024-0a7fbc48e50b",
                    Instance = Param_0,
                    Container = new NamedProperty()
                    {
                        Name = "DepartmentHierarchyToDepartmentsChildren",
                        Value = IIF(
                                  IIF((Param_0 == null), null, Param_0.DepartmentHierarchyToDepartmentsChildren) == null,
                                  null,
                                  IIF((Param_0 == null), null, Param_0.DepartmentHierarchyToDepartmentsChildren)
                                    .Select(Param_1 => new SelectAll
                                    {
                                        ModelID = "2cd45fee-a6aa-4d0e-9024-0a7fbc48e50b",
                                        Instance = Param_1
                                    })
                                )
                    }
                });

How to fix this error without AllowMultipleQuery=true