Add XBLNR field at MB26 and pass value to Material document

Hi all,

We use "Material Slip" field in MIGO when we make material movements, specially movements 521 and 201, in order to save an external number:

This field is very useful because users can check this number on MB51 report:

We now want to start using Reservations, but we need to have this field. I was checking all EXITs for tcode MB21 and MB26 and no one has this field XBLNR. Nevertheless, no one has the possibility to change data on MKPF table.

Is there a way to adding this field?

Thanks and regards,

AW