AMB111I

Explanation
The specified data set cannot be opened.  The DD
statement defining that data set  be missing.
In the message
text: dsname
The name of the data set.

System action
Processing ends if ddname is
SYSIN or SYSOUT; otherwise, processing continues with the next control
statement.

System programmer response
Make sure that the JCL for the step
includes a DD statement that properly defines the data set.  Run the
LISTVTOC function of the IEHLIST utility to obtain a list of the volume
table of contents of the volume containing the data set.

Source
List service aids

Module
HMBLKCTL

Routing code
Note 11

Descriptor code
-