To reconfirm again, the load module is authorised (AC=1) and we did not break 
the authorisation by coding STEPLIB.

I found few interesting things related to wait on SVC 99 today,
The program XYZ uses SVC 99 in two different places (both using the same 
allocation request block & allocation pointer).

The same program XYZ after receiving Dataset information from catalog (say 
for eg: USERID.TEST.DATASET in VOL123) using SVC 99 does issue an SVC 99 
on USERID.TEST.DATASET at a later stage.

So before executing the program XYZ, we had opened the 
USERID.TEST.DATASET in edit mode. So the program XYZ should have failed 
during SVC 99 as it had done in the case of CATALOG, instead of waiting for 
it. But to our surprise we found the second SVC 99 waiting to get shared 
access on USERID.TEST.DATASET. And when I closed the dataset opened in 
edit mode, the job ran fine to completion.

Any thoughts on why SVC 99 does not for CATALOG alone?

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