increasing the default length of selection text for select options

I want to change the selection text of the highlighted fields from default length of 30 characters to 34 characters.
please help me.

SELECTION-SCREEN BEGIN OF BLOCK b WITH FRAME TITLE text-002.

PARAMETERS: c_all AS CHECKBOX.

SELECT-OPTIONS: s_pstyv FOR zeref-pstyv,             

                s_erdat      FOR zeref-erdat OBLIGATORY.

SELECTION-SCREEN SKIP.                                    

PARAMETERS: c_double     AS CHECKBOX,               

c_erled      AS CHECKBOX,                 

c_absag      AS CHECKBOX    DEFAULT 'X',

                p_tage(02)   TYPE n         DEFAULT '30'  

OBLIGATORY.  

*  insert FED01

*PARAMETERS: c_double AS CHECKBOX.                     

* end insert FED01

SELECT-OPTIONS: s_pstyvd FOR zeref-pstyv,

* s_erdatd FOR zeref-erdat.

                s_erdatd FOR zeref-erdat    OBLIGATORY.  

SELECTION-SCREEN END OF BLOCK b.