IDC3026I   DUPLICATE DATA SPACE NAME ON VOLUME

A DEFINE operation specifies the name of a data set, with the UNIQUE attribute, but there is already a data set on the volume with the same name. This will also occur when attempting to define a key sequenced data set (KSDS), with the UNIQUE attribute, which has more than one key range on the same volume. See the associated second-level message for the specific catalog management error code values.

In the Time Sharing Option/Extensions (TSO/E) environment the second-level message is not displayed, except by request. To request it, enter a question mark (?) after the TSO READY message.