The problem does not apply to BSAM or other access methods.
Please see APAR OA50061 for additional information.
++APAR for OA50061 should be applied for all environments with zEDC compressed data sets. This requires an IPL to activate.
You can find the APAR information over here where you can find some more info :
"During creation of a new extent during CLOSE processing, anyFor the moment it also says : "++APAR will be available soon".
user blocks that have not been compressed and written out to the
zedc compressed dataset yet will not be written out.
This does not apply to BSAM processing since all outstanding
WRITE requests must be CHECK'd for completion before CLOSE is
If you haven't signed up to the Red Alerts by now, you really should do it. Just go over here.