Any way to delete appended details

We made a mistake on a job and got details using the append details screen and accidentally duplicated the assemblies on a job. We realized this immediately but we cannot delete the duplicate assemblies because it says that there are P.O.s linked to the material requirement. Even though there are no lower level parts or operations brought in below this sub-assembly, so there would be nothing tied to it. Is there a way to delete them? Or do we just have to manage it thought the system manually until they can close out the job?