user exit for idoc extension for material master (matmas05)

Hello all,

I have 10 custom fields added to anl idoc of basic type matmas05.

i created a new segment under parent segment E1MARA1

Now i want to find out the user exit where in i can write a code to read the data of this segment and populate into the data base table.

Can anybody provide me with the name of the user exit?

Regards,

Roshani