Diagnosis
You tried to create a subscription in the Administration Console. Inorder to save the subscription, the Administration Console has toselect information about the synchronization BDoc which correspondentto the selected publication. This information is not available.

Procedure
In the Administration Console, change to object type Publications anddouble-click the publication to be subscribed to. Remember the assignedreplication objects and open transaction SBDM (BDoc Modeler) where youshould check whether the BDocs for these replication objects areinactive. The names of the BDocs are the same as those of thereplication objects. Activate all inactive BDocs and try to create yoursubscription.