material document number is blank, how to delete it?

Hi,

While debugging, we had given x as material document number as input in GR posting and the GR got posted, but it displays material document number as blank. Since GR has got posted, while debugging, the budget is consumed but there is no Accounting document in it and none of the fields are updated, when i check the "display matrial doc using MIGO"  Now i want to delete that matrl document. So what are the tables I need to delete...like EKBE(PO histry), MSEG, MKPF....What else table...and how to do it....pls advice on this and let me also know, if there is any other way...

Thanks