Hi Priya,
The changes Need to be done in the DME structure.
However, can you provide more Information on whether you are populating all documents Together in the same field (e.g. Doc1, Doc2 etc.) or it is a Counter (e.g. Doc1 then its Details, Doc 2 , then ist Details etc.)
For 1st one check the length defined for fieldFor 2nd one, you Need to check the Repetation faction defined for the Level.
BR
Amitash