BDC Issue - urgent

After entering the document no , document type,document part and the document version

in the first screen of CV01N transaction and in the next screen i enter the lab/office no and

then i choose the tab object links and there i choose material master and entered the material no

and then using the insert row option , i entered the materials one by one .Now i save the recording.

My requirement is that,wat changes can i make in the bdc code which gets generated,so that i am able to

upload the flat file data where for a combination of same document no,document type ,

document part,document version,lab office - i need to have different material nos maintained.

I ll be thankful for your valuable advice.