Changing Base unit of measure MM42

Dear All,

I need to change unit of measure in MM42 but i am not successful.

What I did:

1.) I removed all sites stocks by issuing all to individual cost centers

2.) I put deletion indicator on all PO's

3.) I checked if the article is a part of a component (its is not part)

4.) I simulate the article in WSE1 if theres any inforec or still PO active in this article (non)

What else? I still cannot change the Base UOM.

Is there a step in MM42 how to change this?

Everybody's reply is highly appreciated. Thank you.

Regards,

Ber