How to adjust database table using ABAP code

Hi Experts,

There is any function module can use to adjust the db table?

Because I found that after I modified the database table by using  FM 'DDIF_TABL_PUT' and 'DDIF_TABL_ACTIVATE',

the table feel like no changes when I check the table in SE11.

But after I switched to edit mode, then only table changed to the expected properties.

Hope anyone can some hints,

Thanks in advance.