Many transactions behave differently when executed in foreground and background. The fields on the screen may be different.
In transaction SHBD when starting a recording there is a checkbox where you can select 'Simulate Background Mode'. If you do your recording using this option you will get the code suitable for background mode. If you do not select this option you will get a code for foreground mode.
By compairing the two codes you will know the changes required for background mode.
Hope this helps you
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