ALV Problem

Hi Experts,

I have one query in ALV fieldcatalog.

I am using REUSE_ALV_FIELDCATALOG_MERGE & passing standard structure.

Now in that structure say ABC having field F1 having data type CHAR(10).

I wanted to increase the length of field F1 to 30. So, I have declared one field named say LV_F1 having length 30.

I have added appended that field i.e. LV_F1 in my fieldcatalog.

I have populated the data properly in my internal table ITAB.

After displaying output I am able to see field ABC-F1 in my output display.

If I change the layout & select my field LV_F1 i m getting dump.

Anybody will give me suggestion pls??