Add field to DataSource 0MAT_PLANT_ATTR

Hi all,

DataSource 0MAT_PLANT_ATTR is fetching data from table MARC. The structure did not have field STEUC so I added it in it without usin append since STEUC is a field in table MARC. When I activate the structure and go back into RSA6 in chage mode i do not see the new field added in the structure. I cheched table ROOSFIELD and the field status is A. How can i change that ?

Cheers~