Re: How to change the screen in transaction MM01.

you define your own screens in SE51, you create the frame program to validate the entries in that screen and finally you call the

BAPI_MATERIAL_SAVEREPLICA

or

BAPI_MATERIAL_SAVEDATA

to let SAP do what you want.

There are many BAPI, choose the appropriate in SE37. Enter BAPI*MATERIAL* and press F4