Error during MM data model extension

Dear Experts,

We recently configured SAP MDG M(MDG 8.0 ) in our SAP system and extended few attributes in Material Entity .When we activated the data model,it gave us following error.See the screen shot.

Not sure but one new thing which I did was I maintained Namespace /ZMM/ during data model extension as stated in the Guide for MDG 8.0.This step was not there in MDG 7.0.

Also when I got to Generate Data Mode; Specific Structure I see some entity is prefixed with /ZMM/ and some with ./MDGMM/.See the screen shot.

Should I generate complete structure for MM data model?

Let me know how should I resolve the issue.Its urgent.

Regards,

Neethu JoY