GLO2145I Volume ADD not performed due to multiple opens against data set.

Explanation A VOL_ADD operation was requested, but could not
be performed because more than one DCB is open concurrently against
the non-VSAM data set and BYPASS_CHECK=MULTOPEN was
not specified. Performing a VOL_ADD might compromise data set integrity
or cause unpredictable results.

User response If you are certain that the executing program can
properly handle the multiple concurrent OPENs against the data set,
specify BYPASS_CHECK=MULTOPEN to bypass the integrity
check. For more information, see Bypass integrity check processing (BYPASS_CHECK).