please help (urgent) unicode error

Hi experts ,

i have these two structure in my code .plz hel me in resolving these issuses.

according to me i am gettin this error bcoz of this statement

<b>tab1 TYPE x,</b>

plz help me as it is very urgent for me

thanx in advance.

DATA:BEGIN OF it_file OCCURS 0,

rec(1200),

END OF it_file.

DATA:BEGIN OF it_proj OCCURS 0,

line_id(1) TYPE c,

tab1 TYPE x,

pspid LIKE proj-pspid,

tab2 TYPE x,

post1 LIKE proj-post1,

tab3 TYPE x,

vernr LIKE proj-vernr,

tab4 TYPE x,

astnr LIKE proj-astnr,

tab5 TYPE x,

status LIKE tj02t-istat,

tab6 TYPE x,

prctr LIKE proj-prctr,

objnr LIKE proj-objnr,

END OF it_proj.

error coming in statement:

APPEND LINES OF it_proj TO it_file.

error is :

"IT_FILE" and "IT_PROJ" are not mutually convertible. In Unicode

programs, "IT_FILE" must have the same structure layout as "IT_PROJ",independent of the length of a Unicode character.