Can we change the fields of database unique index in a customised table?

Hi all..
I want to know that can we create or change or delete the database unique index of a customized table?
In my case, there is a customised table with 4 primary keys with all the records to be maintained thru transaction code SM30.
There is database unique index maintained for this table which has 2 fields. These 2 fields are out of the 4 primary fields of the table.I hope I have made myself clear!
Now when I am trying to insert a record in the table it give me a short dump.( It says duplication of records is not allowed)
The reason being that the new record that I am trying to insert in the database table has those 2 fields for which the unique index is maintained is the same as an already existing record.And the other two fields are different from the already existing record.So overall the combination of the 4 primary fields is different.
Please tell me how shall I proceed now?
I also tried to change the Unique index but it is asking me some kind of authrization(You are not authorized to make changes (authorization object S_DEVELOP)).Also I am not sure whether changing the unique index is feasible or not.?
Thanks.

hi
I think you will not be able to do unique indexing withou the help of primary keys,so use all the primary keys into the table field selections and and then create indexing otherwise dupilication of keys can occur. if you are not able to keep the primary keys then go for non unique key indexing,where you have to add the client field and the any keys of your wish.

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