Hallo Michi,
ich denke da hilft Dir dies:

To delete journal receivers, on the operating system command line type the following:

DSPOBJD OBJ(*ALL/*ALL) OBJTYPE(*JRNRCV)

If they are large, on the operating system command line type the following:

WRKJRNRCV JRNRCV(*ALL/*ALL)

Press the Enter key. Select Option 5 to display and check the status. If SAVED or ON-LINE, they may be possibilities to delete.