Batchfile: Problems to get errorlevel, it is always 0 - batch-file

Question

scripters,
at first sorry for the last post.
Realy, i hope i could make you understand my problem now.
I realized that the problem is inside my script only.
If i run the line in the command prompt it works fine.
That means the Errorlevel is stored to exitCode.txt correctly.
START /B "some title" cmd /C "subroutine.bat& >"exitCode.txt" (call echo %^errorlevel%)& >"status.txt" (echo done) & (if defined return call echo %^return%) >"return.txt"" 1>"stdOut.txt" 2>"stdErr.txt"
This is a part of my script
So in :treath.run is the START /B .... line
Inside the script the errorlevel is not stored correctly inside the definded file.
Why?
The return Value is stored perfect.
I dont't get it.
Save this as main.bat
#echo off
setlocal ENABLEDELAYEDEXPANSION ENABLEEXTENSIONS
pushd "%~dp0"
:main
call :treath.import
call :treath.init "t1" "call subroutine.bat"
call :treath.run "t1"
:loop
call :treath.status "t1"
if "!return!"=="done" goto done
echo !return!
goto loop
:done
echo Now goto "!%t1%.stdExitCode!"
echo.
echo The Subroutine should return Errorlevel 1
echo But it is 0, in the file.
pause
EXIT
goto main
:::::::::::::::::::::::::::::::::::::::
:treath.import ()
set "return="
setlocal
set "objID=__OBJ_TREATH"
set "workdir=%tmp%\BATCH_OBJ\%objID%"
if not exist "%workdir%" (mkdir "%workdir%" || exit /b 1)
set /a "timeout=999"
:newSessionID
set /a "sessionID=%random%"
set "sessionDir=%workdir%\%sessionID%"
if exist "%sessionDir%" (
set /a "timeout-=1"
if !timeout! LSS 0 exit /b 1
goto newSessionID
)
mkdir "%sessionDir%" || exit /b 1
endlocal & (
rem set "%objID%_identifier=%objID%"
set "%objID%_version=0"
set "%objID%_sessionID=%sessionID%"
set "%objID%_sessionDir=%sessionDir%"
)
exit /b 0
:treath.init (treathName,"command")
set "return="
setlocal
rem hardcoded obj ident
set "objID=__OBJ_TREATH"
rem objID
set "prefix=%objID%_%~1"
rem treath folder
set "workdir=!%objID%_sessionDir!\%~1"
mkdir "%workdir%" || exit /b 1
set "command=%~2"
endlocal & (
set "%prefix%.command=%command%"
set "%prefix%.workdir=%workdir%"
set "%prefix%.stdOut=%workdir%\stdOut.txt"
set "%prefix%.stdErr=%workdir%\stdErr.txt"
set "%prefix%.stdDump=%workdir%\stdDump.txt"
set "%prefix%.stdExitCode=%workdir%\stdExitCode.txt"
set "%prefix%.return=%workdir%\return.txt"
set "%prefix%.stdStatus=%workdir%\stdStatus.txt"
set "%~1=%prefix%"
)
exit /b 0
:treath.run (treathName)
set "return="
setlocal
set "title=%~1"
set "prefix=!%~1!"
type NUL >"!%prefix%.stdExitCode!"
type NUL >"!%prefix%.stdOut!"
type NUL >"!%prefix%.stdErr!"
type NUL >"!%prefix%.stdStatus!"
rem errorlevel ist immer 0 ???
START /B "%title%" cmd /C "!%prefix%.command!& >"!%prefix%.stdExitCode!" (call echo %%^errorlevel%%)& >"!%prefix%.stdStatus!" (echo done) & (if defined return call echo %%^return%%) >"!%prefix%.return!"" 1>"!%prefix%.stdOut!" 2>"!%prefix%.stdErr!"
>"!%prefix%.stdStatus!" (echo running)
exit /b 0
:treath.status (treathName)
set "return="
setlocal
set "prefix=!%~1!"
endlocal & (
set /p "return="<"!%prefix%.stdStatus!" || exit /b 1
)
exit /b 0
Save this as "subroutine.bat"
set "return=This is a Test"
exit /b 1