Cancel single item from material document

Hi. Let's say that on material document there are:

MATNR 1 - 5 items

MATNR 2 - 10 items

I need to cancel only 1 item from MATNR 1. So after that operation document should be:

MATNR 1 - 4 items

MATNR 2 - 10 items

In MBST transaction there is no possibility to do such thing. You can only calncel the whole line (in that case 'MATNR 1 - 5 items').

Is there some possibility to customize MBST to fit my requirements? Or maybe there is some other transaction which give me opportunity to cancel only 1 item? Please give me some tip. Greetings. P