Changes in MSC2N is not reflected in MCHA

Hi All,

I have created the batch using transaction MSC1N.

so batch entry has got created in MCHA and MCH1 tables.

After that I did changes in batch level using transaction MSC2N

now there are two fields in MCHA and MCH1 created on and changed on .

After doing changes in batch using MSC2N

only MCH1 table has got modified

but MCHA table entry is showing only created on value

and Changed on field is empty means this entry is not modified

can any body explain me why this is happening.