GLO3145I Volume add not performed due to multiple opens against data set.

Explanation A VOL_ADD operation was requested, but was not performed
because more than one ACB is open concurrently against the 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).