Updated service program, but not seeing changes

Hi all,

I am a bit confused by some service program behaviour.  I have a program 
PGMA which calls a service program SPPARTS containing one module PARTS. 
This module contains a number of procedures, the most recently added is 
called "updateMinMax".

I found a problem in the updateMinMax procedure in which it was returning 
an error when it should not have been, due a condition that needed to be 
more granular.  So, I opened the source for the PARTS module, split up the 
condition and compiled, overwriting the existing PARTS module.  Then I 
issued the command "UPDSRVPGM MYLIB/SPPARTS MODULE(MYLIB/PARTS)".  Note 
that no procedures were added or removed and no parameters were changed. I 
got the message that the service program was updated.  The service program 
is ACTGRP(*CALLER).

When I called the program, the error was still showing up when it should 
not have been.  The call order is like this, starting by issuing the 
command to start the main menu application:

main menu ----> vehicle maintenance menu ---> work order menu (this menu 
has a named activation group VMACTGRP) ---> PGMA ---> SPPARTS

So, since I had done an UPDSRVPGM, and the activation group was not in use 
by my job, I thought I should see the changes.  When this didn't work I 
tried recreating the service program.  This didn't work either and I had 
to sign out and sign back in to see the changes.

I've skimmed the ILE Concepts Reference to see if I can check my 
assumptions about how UPDSRVPGM works, but didn't find anything to explain 
this behaviour.  Can someone shed a bit of light on why the program saw 
the old version of the service program until the job ended?

Thanks in advance,
Adam
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