Confusion of Sec.80U and 80DD

Sachin Thakar (Student) (49 Points)

05 February 2019  
if husband-wife are having salary income and wife already have housing loan interest, so she does not need to take deduction of 80U.
can her husband claim 80DD, in spite of wife having enough income.
what are the requirements to claim 80DD? is there any problem??