VFYIMGCLG Sort

This morning, after downloading the latest cume for v5r4 and loading it to the virtual optical drive, I ran (as I usually do) the VFYIMGCLG SORT(*Yes).

Usually, in fact always in the past, this has put the images in the same order as the image number; e.g., SF99540_1.bin, SF99540_2.bin, etc. So that, when I use the WRKIMGCLG command to view the catalogue, the index numbers are the same sequence as the images. E.g., SF99540_1.bin is index #1.

But today the first index number in the image catalogue was SF99540_9.bin, the second index was SF99540_10.bin, the third index was for another PTF group (SF99114_1.bin). The non-cume groups were in the correct order, but SF99540_1.bin followed the non-cume images so that SF99540_1.bin was index number 10.

I used the change option to put the images in (what I think is) the correct order: SF99540_1.bin is now index #1, SF99540_10.bin is index #10, SF99114_1.bin is index #11, etc. I.e., the same order in which I would have inserted the physical CD's into the optical drive if I had planned to load them manually.

First, anyone have any idea why the SORT(*Yes) sequencing of the image catalogue indices came out in a different order from the physical image number (_1, etc.)?

Second, based upon that answer, did I do the right thing by re-assigning the index numbers? Or is the i OS PTF function smart enough to know what order to use the images regardless of the image catalogue's index number?

Thanks.