how the data base records created in hana database

Hi ,

i am new to HANA and understand the concept of row storage and coulumn storage.i have migrated one bw infocube to hana optimised cube.

it has onl;y one key filed and rest all are master data sids.

when i see the data in the fact table the key filed values is repeating which should not be in a database table.

i found that the no of unique values which is repeating  is equal to the no of charcterstics in the cube.

could somone please explain how it gets generated and how it works.

examlple

key field     filed 1     field 2

1                 a                b

1                 a                 c

1                 b                 d

The key field contains the unique record equivalent to the number of charcterstics.

Thanks,

Ranjan