Diagnosis
You want to delete a relation between a BDoc type and a site type. Thedeletion is currently not allowed for these objects, the relation isstill needed by the system. Assignments between sites and subscriptionsare existing in the Administration Console (Transaction SMOEAC).

Procedure
Open the Administration Console and search for the site(s) in the errormessage. Delete all assignments to subscriptions mentioned in the errormessage. Ensure by checking transaction SMOHQUEUE that all jobs writtenby the deassignment are finished. Afterwards try to delete the BDoctype/sitetype relation.