I have found the following problem with nested BAT files:

File moppwt.bat:

@Echo Off
call oppwt seller.opl
if errorlevel 1 goto Zle

rem place 2
call oppwt kom20.opl
if errorlevel 1 goto Zle

File oppwt.bat:

c:\!JT.C\psion\opp\opp -d_WORKABOUT -iC:\!JT.C\psion\opp\include %1 %2 %3 %4 %5

When I start moppwt it will cal oppwt at first place but after this will exit so place 2 is never reached.
Oppwt cals opp.exe file