Return Code value using 'starting new task' and 'wait until'

I'm having a minor issue with some return code values in my ABAP.
This is what part of it used to look like before I modified it:
With Code in version 1, the sy-subrc was not always zero, sometimes it would be 4.
That was fine, and my abap would do something based on the non-zero RC.
had a need to implement an RFC timeout, the only way I could see to do it was to use 'starting new task' etc as seen in Version 2.
However, with my changes, sy-subrc is always zero.
The ABAP runs fine but I know that sy-subrc should sometimes be 4, even when it returns within the allotted 60 seconds.
Maybe I've coded it incorrectly.
Can someone point me in the right direction?
#>> Start of VERSION 1
call function 'MY_FUNCTION_MODULE'
       destination RFCDEST
       tables
            orders_list          = t_orders_packet
            apo_orders_list      = t_apo_orders
            apo_resources        = t_apo_resources
       exceptions
            COMMUNICATION_FAILURE    = 1 MESSAGE MSG_TEXT
            SYSTEM_FAILURE           = 2 MESSAGE MSG_TEXT
            NO_ORDERS_SUPPLIED       = 3
            NO_PEGGED_ORDERS_FOUND   = 4
            ORDERID_CONVERSION_ERROR = 5
            OTHERS                   = 6.
if sy-subrc is initial.
* do some stuff as RC was 0
else.
* log non-zero return code etc
endif.
* << End of Version 1

And now Version 2.
I didn't put this into the 1st post as the formatting goes bonkers.
#>> Start of VERSION 2
call function 'MY_FUNCTION_MODULE'
       destination RFCDEST
       starting new task 'taskname'
       performing receive_result on end of task
       tables
            orders_list          = t_orders_packet
            apo_orders_list      = t_apo_orders
            apo_resources        = t_apo_resources
       exceptions
            COMMUNICATION_FAILURE    = 1 MESSAGE MSG_TEXT
            SYSTEM_FAILURE           = 2 MESSAGE MSG_TEXT
            NO_ORDERS_SUPPLIED       = 3
            NO_PEGGED_ORDERS_FOUND   = 4
            ORDERID_CONVERSION_ERROR = 5
            OTHERS                   = 6.
WAIT UNTIL results_received = 'X' UP TO 60 SECONDS.
if sy-subrc is initial.   << Now this is always ZERO
* do some stuff as RC was 0
else.
* log non-zero return code etc
endif.
FORM receive_result USING iv_taskname.
RECEIVE RESULTS FROM FUNCTION 'MY_FUNCTION_MODULE'
       tables
            orders_list          = t_orders_packet
            apo_orders_list      = t_apo_orders
            apo_resources        = t_apo_resources
       exceptions
            COMMUNICATION_FAILURE    = 1 MESSAGE MSG_TEXT
            SYSTEM_FAILURE           = 2 MESSAGE MSG_TEXT
            NO_ORDERS_SUPPLIED       = 3
            NO_PEGGED_ORDERS_FOUND   = 4
            ORDERID_CONVERSION_ERROR = 5
            OTHERS                   = 6.
results_received = 'X'.
endform.                    "receive_result
* < End of Version 2

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And now Version 2.
I didn't put this into the 1st post as the formatting goes bonkers.
#>> Start of VERSION 2
call function 'MY_FUNCTION_MODULE'
       destination RFCDEST
       starting new task 'taskname'
       performing receive_result on end of task
       tables
            orders_list          = t_orders_packet
            apo_orders_list      = t_apo_orders
            apo_resources        = t_apo_resources
       exceptions
            COMMUNICATION_FAILURE    = 1 MESSAGE MSG_TEXT
            SYSTEM_FAILURE           = 2 MESSAGE MSG_TEXT
            NO_ORDERS_SUPPLIED       = 3
            NO_PEGGED_ORDERS_FOUND   = 4
            ORDERID_CONVERSION_ERROR = 5
            OTHERS                   = 6.
WAIT UNTIL results_received = 'X' UP TO 60 SECONDS.
if sy-subrc is initial.   << Now this is always ZERO
* do some stuff as RC was 0
else.
* log non-zero return code etc
endif.
FORM receive_result USING iv_taskname.
RECEIVE RESULTS FROM FUNCTION 'MY_FUNCTION_MODULE'
       tables
            orders_list          = t_orders_packet
            apo_orders_list      = t_apo_orders
            apo_resources        = t_apo_resources
       exceptions
            COMMUNICATION_FAILURE    = 1 MESSAGE MSG_TEXT
            SYSTEM_FAILURE           = 2 MESSAGE MSG_TEXT
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            NO_PEGGED_ORDERS_FOUND   = 4
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results_received = 'X'.
endform.                    "receive_result
* < End of Version 2

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""Local interface:
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DATA: jtab LIKE payr OCCURS 0 WITH HEADER LINE.
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DATA: it_bank1 LIKE zpayr OCCURS 0 WITH HEADER LINE.
TYPES : BEGIN OF ty_bseg ,
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             hbkid LIKE bseg-hbkid,
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ENDLOOP.
REFRESH chqdetails.
chqdetails[] = it_bank1[].
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ENDFUNCTION.

Return Code value using 'starting new task' and 'wait until'

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