CJ20N Userfield USR00 inactive

Hi Gurus,

I am working on the new assignment of changing the description of the USR00 field and  Inactive in CJ20N Tcode.

I am able to change  the Description to "segment" through table  TCN01.

The value is to  be populated through program.I achieved that by using the ZXCN1U01.

However,I am not able to make the field  Inactive.

will you please help me out,by suggesting any BADI/user-exit for this prupose?

Thanks in advance,

Lakshmi