QMHSNDPM

I'm trying to use QMHSNDPM to send myself program messages for use with a
message subfile. I can get everything to work as long as I don't specify any
replacement data fields in my messages. So I'm stuck with a message like
"Invalid Item Number" instead of being able to do something like "Item
'AH102' is an invalid Item Number". (Where I'd pass 'AH102' as the data and
5 as it's length.) 
I think my problem is in my parm to QMHSNDPM which specifies the length of
the data I want to pass or I've messed up somehow defining the message in
the message file... (I'm usually getting CPF24B6 errors in my APIErr parm
once I make the call.) 
Any suggestions? 

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