System variable for program name invalid

Hello,

I have a problem, i have two RPG/400 programs. 

One program , lets call it ProgA calls the other program ProgB. No problems at 
all. 

Ok, now the following. The programmers who coded before me decided to use the 
system data structure Progname (pos. 1-10) for the Message files. So, whenever 
a call to sndpgmmsg is done, the message-file variable = W#PGMN (either filled 
with ProgA or ProgB).

Still no problems, everything works ok. But now whenever i recompile ProgB 
(even if i dont adjust anything!) it happens that the programname variable is 
filled with something like 'Q1A9B26BEB.' So whenever i fire-up the ProgB (thru 
ProgA) an error appears cause it cannot find the messagefile "Q1A9B26BEB."

When i cancel all the error-messages and restart the ProgA and then go to ProgB 
the error will not appear anymore.... until i recompile progB.

Weird?

Hopefully someone can help me out,

regards

FrankvanLeeuwen