What does MQRCCF_PARM_CONFLICT mean?

I’ve been using PCF (from Python) and have been getting MQRCCF_PARM_CONFLICT. For example use MQCMD_CHANGE_Q_MGR and set MQIA_TCP_CHANNELS to 201.

The documentation does not help. It says

Explanation

Incompatible parameters or parameter values.

The parameters or parameter values for a command are incompatible. One of the following occurred:

1. A parameter was not specified that is required by another parameter or parameter value.
   • The MQIA_TCP_CHANNELS can be used on its own – so it is not this one.
2. A parameter or parameter value was specified that is not allowed with some other parameter or parameter value.
   • The MQIA_TCP_CHANNELS was specified on its own – so it is not this one.
3. The values for two specified parameters were not both blank or non-blank.
   • Only one parameter was specified – so not this one.
4. The values for two specified parameters were incompatible.
   • Only one parameter was specified – so not this one.

I found the problem by issuing the command and seeing what the response was.

QM01 ALTER QMGR TCPCHL(201)

gave

CSQM150I QM01 CSQMAMMS ‘TCPCHL’ AND ‘MAXCHL’ VALUES ARE INCOMPATIBLE
CSQ9023E QM01 CSQMAMMS ‘ ALTER QMGR’ ABNORMAL COMPLETION

So I would add reason

5. The specified value is inconsistent with the configuration.