How does a program knows whether it runs asynchronous?

We have a tool which runs fine at several systems, but fails for one customer.
It displays a list of analysed data and offers the option to update some material master data to adapt mrp data of material master to the real situation of selected material. The update is done with an asynchronous call of function material_maintain_dark, results (success or error messages) are written to sytem log.
In one system this logic fails, because customer has an implementation in one of the user exits of function material_maintain_darc which calls a popup.
    IF sy-batch IS INITIAL AND sy-binpt IS INITIAL.
      CLEAR: l_text_table[], l_text_table.
      MESSAGE w001(z_sdc) INTO l_text_table-tdline.
      APPEND l_text_table.
      CALL FUNCTION 'COPO_POPUP_TO_DISPLAY_TEXTLIST'
        EXPORTING
          titel      = 'Warning'
        TABLES
          text_table = l_text_table.
    ENDIF.
Popup correctly will not be displayed when programm runs in batch mode.I think we need a similar check to avoid the popup when the program runs asynchronously, but I could not find any matching indicator in structure syst (I could not find documentation for really all fields) or anywhere else.
Can anyone help and tell me how I can check at runtime whether a program runs asynchronously.

It was not my decision to use this popup. Customer has it as own coding in an unserexit of function material_maintain_dark probably created during implementatiion project by customer himself or any consultants.
We delivered a 'consulting solution', a program which uses function material_maintain_dark and works fine on several other customers systems, where no user exit is implemented.
Customer regards it as an error of our customer solution, that the booking of changes of material master, which is triggered by our program does not work in his system: There only is a message, that program is triggered, but it cannot be completed properly and they see neither results in material master nor entries in system log.
My idea was to add a check, whether the function material_maintain_dark was triggered by our customer solution via call function.. starting new task or whether it is used by any of the customers own processes, but I have no idea how to find out, whether function was called with or without 'starting new task'.

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Now for some deeper explainations. From the code it appears that exactly 1 of 6 valves may be used and an additional valve may be in one of two possible states.
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