How to change domain length in SE11.

Sir,

I am developing form ( Script SE71 ) .

My query is to write Company name at header level

and I am selecting that field from table ( T001-BUTXT )

and its domain length is 25. But I want to write different

company name's for that I required length of domain at least 30 charater or

more.

.. So, how can I increase the lenght of above field or domain in data dictionary

I am thinking to change domain with another domain but really it is correct

way or any other to change field length.

Thanks & regards

Manoj Pise.