Entity Framework BuildContainsExpression Causes Internal .NET Framework Data Provider error 1025

I'm trying to get the following LINQ query to work against the database (3.5 SP1):

var labelIds = new List<int> { 1, 2 };
var customersAggregatedTransactionsByType =
    (from transactions in context.TransactionSet
    from customers in context.CustomerSet
        .Where(LinqTools.BuildContainsExpression<Billing.Customer, int>(u => u.LabelId, labelIds))
    from accounts in context.AccountSet
    where customers == accounts.Customer
        && accounts.Id == transactions.Account.Id
        && transactions.DateTime >= fromDate && transactions.DateTime < toDate
    group transactions.Amount
    by new
    {
        UserAccountId = transactions.Account.Id,
        TransactionTypeId = transactions.TransactionTypeId,
        BaseAssetId = accounts.BaseAssetId
    } into customerTransactions
    select customerTransactions).ToList();

Once I add Where(LinqTools.BuildContainsExpression(u => u.LabelId, labelIds)) I get the following exception:

System.InvalidOperationException: Internal .NET Framework Data Provider error 1025.

If I remove Where(LinqTools.BuildContainsExpression(u => u.LabelId, labelIds)) all's good.

Any help will be appreciated.

Thanks, Nir.