VTAM® issues this message when the host subarea PU name defined on the HOSTPU start option is one of the following reserved words: VTAMSEG, VTAMSG2, VTAM, ISTNOP, ISTPDCLU, ISTGROUP, or ISTATA00.
value is the value defined for HOSTPU.
VTAM ignores the value of HOSTPU. VTAM will issue message IST1311A to prompt you for the correct value of HOSTPU.
Enter a valid value for HOSTPU in response to message IST1311A. You can also enter a blank if you want to accept the default value for HOSTPU.
If HOSTPU is coded in an ATCSTRxx file, correct the value for HOSTPU in that file. For more information about VTAM start options, see the z/OS Communications Server: SNA Resource Definition Reference.
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