Regarding automatically update of transaction through BDC

Hi All,

I am doing BDC for updating tab delimited file(e.g file 1) for transaction MB1A which is done and the first part..now the second part is when tthe updation of <b>MB1A</b> is finished , the user will press save button which will call another Transaction <b>MB1C</b> and automatically update another tab delimted file

(e.g file 2)..PLz help me out as how to do this ...

If any code is there plz send it????

waiting for the help ASAP...