PTF from Image Catalog loading from where?

Hi,

I don't know what is going on here with a PTF.
I downloaded PTF SI59204 from Fix Central directly to an Image Catalog on my Power7 server.
I look at the text file S9236.TXT in the IFS directory and it says I did download that PTF and a Co-Req. PTF.
The bin file is named S9236V01.BIN.

So, then I do the LODIMGCLG and then GO PTF and use option 8.
The PTF fails, and here's the joblog...

Image catalog V7R3CUME loaded in device VRTOPT.
Volume C6841367_01 added to optical device.
Volume C6841367_01 added to optical device.
Library QSRV cleared.
No PTFs loaded.
PTF 5770SS1-SI74624 V7R3M0 not applied.
PTF not applied because error occurred.
PTF install processing failed.

V7R3CUME is the Image Catalog and VRTOPT is the Virtual Optical Device.
But where does C6841367_01 come from? The file is S9236V01.
And PTF SI74624 is not the PTF I loaded, nor is it for 5770SS1 (it's for 5773SC1).

How is this happening?

Here's the Image Catalog...

Work with Image Catalog Entries
System:
 Catalog  . . :   V7R3CUME                Status . . . : Ready
 Type . . . . :   Optical                 Device . . . : VRTOPT

 Directory  . . . . : /cume_directory

 Type options, press Enter.
   1=Add   2=Change       4=Remove   6=Mount   8=Load 9=Unload
   10=Initialize volume   12=Work with volume

 Opt   Index  Status      Image File Name
*AVAIL
           1  Mounted S9236V01.BIN