Local Variable or Bug -- RPG400-L

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The program snippet below will display to the screen

Message 1
Message 1
Message 3

Remove or comment out the "C s 10a based(ptr_Msg)" and the program
displays

Message 1
Message 2
Message 3

My best guess is based(ptr_Msg) is spawning a local ptr_Msg unique to
ProcedureX

Is this effect correct? Is this a bug in the RPG Compiler?

H DFTACTGRP(*NO) ACTGRP(*CALLER)
****************************************************
D ptr_Msg s *
D Msg s 10a based(ptr_Msg)
D Result s 3a

D Msg1 s 10a inz('Message 1')
D Msg2 s 10a inz('Message 2')
D Msg3 s 10a inz('Message 3')
**
D ProcedureX pr
/Free

ptr_Msg = %addr(Msg1);
Dsply Msg '' Result;

Procedurex();

ptr_Msg = %addr(Msg3);
Dsply Msg '' Result;

*inLR = *on;

/End-Free
****************************************************
P ProcedureX B
D PI
D****Remove or comment out the next line of code and the program will work
D C s 10a based(ptr_Msg)
/Free

ptr_Msg = %addr(Msg2);
Dsply Msg '' Result;

Return;
/End-Free
P E
****************************************************

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