Can anyone explain why the following code did not work in AMODE 64 but works in 
AMODE 31?

I received an ABEND S602 R15=0 on the POST.

Abend: S602 

Explanation: An error occurred during processing of a
POST macro instruction. The system issues this abend
only in association with cross memory post processing.
The hexadecimal return code in register 15 indicates the
nature of the error:
Code Explanation
00 The target address space control block (ASCB)
is incorrect.

Per the manual STIMER, WAIT, and POST support AMODE 64.

         STIMER REAL,STIMERX,DINTVL=WKWAITI 
         XC   STIMECB,STIMECB               
         OI   WAITLAST,X'80'                
         WAIT 1,ECBLIST=WAITLIST            

STIMERX  DS    0H              
* TIMER EXPIRED                
         DROP  R12             
         USING *,R15           
*C   POST STIMECB               In AMODE 31
         POST  STIMECB,X'40'   <== Abends on an S602 reason code 0
         DROP  R15             
*C   RETURN                    
         BR    R14  

WAITLIST DS    0F            
ASMNSTOP DS    A             
WAITLAST DC    A(STIMECB)    
STIMECB  DS    F             

When I added the following before the STIMER it worked:

SAM31               
SYSSTATE AMODE64=NO 

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