The initial program load (IPL) program loaded a module into the DAT-on nucleus region. (DAT is the acronym for dynamic address translation.) However, the module contained an unresolved external reference.
The IPL proceeds, but the success of the IPL or subsequent processing is unpredictable.
Notify the system programmer.
If the module is IEANUC0x, link edit it again to determine which CSECT contains the unresolved external reference.
If IBM® supplied the module, search problem reporting data bases for a fix for the problem. If no fix exists, contact the IBM Support Center.
System initialization (IPL/NIP)
IEAIPL02