I am getting a short-dump in screen field conversion

Hi all,

I have following situation :

I have one screen field--->

<b>t_zmmat_doc_item-dmbtr</b>

( Type MSEG-DMBTR )

I have one variable <b>l_dmbtr</b> type MSEG_DMBTR.

If I write this, it is ok.

<b> t_zmmat_doc_item-dmbtr = t_zmmat_doc_item-netpr *

t_zmmat_doc_item-erfmg .

<i>" Rate * Quanty</i></b>

But if I write this, it is giving me a short-dump in screen field type conversion error.

<b> l_dmbtr = t_zmmat_doc_item-netpr * <i>" Rate</i>

t_zmmat_doc_item-erfmg . <i>"Quanty</i>

t_zmmat_doc_item-dmbtr = l_dmbtr.</b>

Where does the problem lies ? I need this l_dmbtr later and to be sent to another screen-field of same type.

Please help.

Regards,

Achirangshu De.