Change length of column in table in SAP BTP ABAP environment

Hello,

I want to change the length of a column of a non key field from 50 to 25 in a table which already has entries. During activation an error is shown:

"Structure change at field level (convert table &)" message class DT Number 064.

In SAP GUI one would use SE14 to do this. How can it be achieved via ADT in Eclipse?