Using your own GroupId

[jbmjlm10]

I'm trying to use my own GroupId value, but MQSeries insists on generating its own. This does not make sense to me. Here's what I have on a c programs:
MQBYTE24 GroupId = "123456";
I also have the following before the PUT:
md.MsgFlags = MQMF_MSG_IN_GROUP ;
pmptions = MQPMO_LOGICAL_ORDER ;
Before I do each PUT, I'm setting the GroupId to "123456"
with the following statement:
memcpy(md.GroupId, GroupId, sizeof(md.GroupId));
I have a printf statements that tells me that md.GroupId is definitely set to:
md.GroupId = 313233343536000000000000000000000000000000000000'X
which is the correct 123456 value. But, after all the messages are put to the queue, and I browse the queue, the GroupId of each message is equal to this:
GroupId : X'414D512045524551534E44312020202040CC6AA8202FC802'
which is an MQSeries generated ID and not my own. What am I doing wrong? Does this make sense? Thank you for your help.

 

[jbmjlm10]

I've answered my own question. If you want to set your own GroupId value, the "pmptions = MQPMO_LOGICAL_ORDER" option should not be used. I removed that and the GroupId was set to the value I specified.