Activation failed in DSO for BI 7

Hi,

I have an existing custom DSO. I want a add a new infoobject ZMATERIAL which has ZMATL_GRP as attribute. I have firstly added ZMATERIAL at data source and acivated . DTP is already activated.

Now I have added ZMATERIAL in DSO and trying to activate the DSO. But getting the following errors- 1. Structure change at field level (convert table /BIC/AZBI7_DSO00)

2. Enhancement category for table missing

3.enhancement category for include or subtype missing

Please guide me , how to resolve this issue

Regards

Deep