pointer in data struct problem

I have a data struct.  It contains a pointer.
  d DemoDs          ds                  qualified
  d pData                           *

I can copy the data struct and the pointer stays pointed.
  d ds1             ds                  likeds(DemoDs)
  d ds2             ds                  likeds(DemoDs)
  d street          s             10a
     street  = 'maple ave' ;
     ds2.pData = %addr(street) ;
     ds1 = ds2 ;
     DsplyDs( ds1 ) ;   // works!

I can return the ds from a proc and the pointer is still pointing.
     ds1          = AssignDs( Street ) ;
     DsplyDs( ds1 ) ;   //  also works.

But when I return the data struct from a proc and on the same stmt pass the
data struct as an arg to another proc:
     DsplyDs( AssignDs( address )) ;  // fails

the pointer arrives in the called proc as not set.

Am I doing something wrong here?  Is this a feature or a bug?

I am at v5r1, have downloaded a lot of RPG PTFs from the IBM support site.
But I dont have software support, so cant call IBM on this.

thanks,

Steve

here is the complete code:


h option(*SrcStmt)
d bug1            pr                  extpgm('BUG1')

d DemoDs          ds                  qualified
d pData                           *

d AssignDs        pr                  likeds(DemoDs)
d  InVar                        10a

d DsplyDs         pr
d  InDs                               value likeds(DemoDs)

d Street          s             10a
d ds1             ds                  likeds(DemoDs)
d ds2             ds                  likeds(DemoDs)
 /free
     street      = 'maple ave' ;

  // assign, then display.
     ds1          = AssignDs( street ) ;
     DsplyDs( ds1 ) ;

  // assign, then display.  only do the assign as an expression
  // that assigns the value to arg1 of the dsply proc call.
     DsplyDs( AssignDs( street )) ;

     return ;
 /end-free

** ------------------------ AssignDs ------------------------
p AssignDs        b
d AssignDs        pi                  likeds(DemoDs)
d  InVar                        10a
d ds1             ds                  likeds(DemoDs)
 /free
      ds1.pData   = %addr(InVar) ;
      return      ds1 ;
 /end-free
p                 e

** ---------------------- DsplyDs ------------------------------
pDsplyDs          b
dDsplyDs          pi
d InDs                                value likeds(DemoDs)
dDsData           s             10a   based(InDs.pData)
 /free
      dsply       DsData ;
 /end-free
p                 e