The ARM log contains the actual LIBREF name from the LIBNAME statement when option ARMSUBSYS=DS_IO or ARMSUBSYS=ARM_ALL is turned on.

When SAS data libraries are concatenated, the LIBREF displayed in the ARM log is a "placeholder" LIBREF used internally by SAS.

No error messages are produced in the SAS log or the ARM log.

No workaround or fix is currently available.

Operating System and Release Information

/* define directories C:\temp, c:\temp\a, c:\temp\b */
/* to replicate problem */

filename armlog "c:\temp\test.arm.txt";
options armloc=armlog armsubsys=(ARM_ALL);
libname x ("c:\temp\a","c:\temp\b");

data x.a;
  a=1;
run;

When code below is run, you get ARM log containing:

I,1539892170.586000,1,0.390625,1.609375,SAS,sasjrs
G,1539892170.586000,1,1,MVA_DSIO.OPEN_CLOSE,DATA SET
OPEN/CLOSE,LIBNAME,ShortStr,MEMTYPE,ShortStr,MEMNAME,LongStr
G,1539892170.586000,1,2,PROCEDURE,PROC START/STOP,PROC NAME,ShortStr
S,1539892170.586000,1,2,1,0.390625,1.609375,DATASTEP
S,1539892170.633000,1,1,2,0.406250,1.640625,#C00042 ,DATA    ,A

U,1539892170.633000,1,1,2,0.406250,1.640625,2,VAR(1,a),DEF
P,1539892170.649000,1,1,2,0.406250,1.656250,0,X       ,DATA    ,A

P,1539892170.649000,1,2,1,0.406250,1.656250,0