If the system is not configured with an esoteric unit SYSDA, or some other esoteric unit is to be used for VIO temporary unnamed work data sets set by c89, the _C89_WORK_UNIT=SYSDA environment variable must be set. Specifying a null value for this variable ("") results in c89 using an installation-defined default for the UNIT. The environment variable is shown being set to the default value:

Element

c89 environment variable

All c89–allocated work data sets

_C89_WORK_UNIT=SYSDA