Query in HIDE statement

Hi all,

Can anyone please tell me why this statement throws a dump.

P_ITAB_DATA STRUCTURE zdetails1.

LOOP AT P_ITAB_DATA1.

WRITE : (120) SY-ULINE.

FORMAT HOTSPOT ON COLOR 2.

WRITE /(7) P_ITAB_DATA-PROJECT.

FORMAT HOTSPOT OFF.

*******dump occurs in this HIDE statement******

HIDE: P_ITAB_DATA-PROJECT.

*******dump occurs in the HIDE statement above******

WRITE 13(1)'|'.

WRITE 15(10) P_ITAB_DATA-GTM_ANCHOR.

WRITE 13(1)'|'.

WRITE 26(20) P_ITAB_DATA-DEL_ANC_NAME.

ENDLOOP.

Kindly reply as fast as possible.

Regards,

Vijay