Manual order stock status

If I create a manual order in back-end including a product bundle, then the stock of the bundled products is not reduced. It only works if I create an order in front-end.
in the setting of my product bundles I haven’t chosen the option “Enable stock management at bundle level.” because I want the bundle to be available based on the stock of the bundled products.

E.g. my bundle A contains products B, C and D. If I create the order in backend with bundle A, it only tells me that the stock of bundle A is reduced, but not the ones from B, C and D.If I then take a look at the stock of bundle A in the product page, there was no stock reduction at all.

Thank you for your help!