1366 Incorrect decimal value: 'f' for column 'value' at row 1
in:
[INSERT INTO zen_orders_total (orders_id, title, text, value, class, sort_order) VALUES ('10', 'Free Shipping:', '£0.00', 'f', 'ot_shipping', '200')]

I receive this error message when testing a downloadable product at step 2 of the checkout (check/money order) as far as I can see I have set all attributes correctly and the product is showing Product is virtual = no always free shipping=no

Can any body help
Please

Thanks

Nigel Carr