Convert hex to char (cvtch)

["Smith, Nelson" <NSmith@xxxxxxxxxxx>]

I'm trying to use cvtch to convert hex data to character, and I'm getting a
space offset error.  Does anyone know what causes this error?  The error
does not occur until the CALLP to cvtch.

Space offset X'07FFEFF0' or teraspace offset X'0000000000000000' is 
  outside current limit for object QPADEV001WDBANS     751610.      
The call to cvtch ended in error (C G D F).                         

My prototype looks like this:

D cvtch           PR                  EXTPROC('cvtch')          
D  ptrCharReturn                  *   VALUE                     
D  ptrHexSource                   *   VALUE                     
D  intCharLength                10I 0 VALUE                     

The field definitions look like this:

D ds_ZDAQ0200     DS                  BASED(ptrZDAQ0200)                    
D  alpUser                      10A                                         
D  alpServer                    10A                                         
D  alpFormat                     8A                                         
D  hexFunctCode                  4B 0                                       
D  alp4HexBytes                  4A   OVERLAY(ds_ZDAQ0200:29)               

D  alp8CharBytes  S              8A   INZ       

the pointer is initialized to the address of the incoming parm and all the
subfields of the data structure look fine, 

and my call looks like this:

C                   CALLP     cvtch(%ADDR(alp8CharBytes)                  
C                                  :%ADDR(alp4HexBytes)                   
C                                  :%Len(alp8CharBytes)  )            

What am I doing wrong?    


>       


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