[Info-vax] Why does this DIFF command fail, then run fine the 2nd time around?

[alanfe...@gmail.com]

$ TO SCRFELD:[TOS]
===============================================================================
Processing SCRFELD:[TOS]
Checking SCRFELD:[TOS]
 
  TO_1 = DISK_USER:[DECUSERVE_USER.FELDMAN]
  TO_0 = SCRFELD:[TOS]  ! (current default)
 
Your default is 
  SCRFELD:[TOS]
 
$ DIFP SCRFELD:[.A.TO_V530]CLEAR_NBACK_LNMS.COM;1 [.B.*]
%DIFF-F-OPENIN, error opening SCRFELD:[TOS.B.*]CLEAR_NBACK_LNMS.COM; as input
-RMS-E-NMF, no more files found
$ 
$ DIFP SCRFELD:[.A.TO_V530]CLEAR_NBACK_LNMS.COM;1 [.B.*]
Number of difference sections found: 0
Number of difference records found: 0

DIFFERENCES /PARALLEL-
    SCRFELD:[TOS.A.TO_V530]CLEAR_NBACK_LNMS.COM;1-
    SCRFELD:[TOS.B.T]CLEAR_NBACK_LNMS.COM;1
$ 

$ SHOW LOG/FUL SCRFELD
   "SCRFELD" [super] = "DSA2:[USR_SCRATCH.FELDMAN.]" [concealed,terminal] (LNM$PROCESS_TABLE)
$ 
OpenVMS V8.4-2L2  

TIA!