Hi
Could you firstly check what is the setting in your system on Control of derived business transaction?
Here you would see how the system generate and posting of the derived business transaction and if Online & Status of Plan: then TPM18 needs to be run in order to create derived business transaction.
How Derived business transaction would be created
Please note that, as I remember, the system behaves differently between MM products and Derivatives in terms of DBT, howeever FX product types should be the same way as MM.
Hope that this helps