Should I add index on VBRP for performance

Hi All,
I developed a Report. Here -
SELECT statement of VBRP table is taking too much time for execution.
SELECT vbeln posnr netwr matnr
      INTO TABLE IT_VBRP
     FOR ALL ENTRIES IN IT_VBAP
     WHERE AUBEL = IT_VBAP-AUBEL
           AND AUPOS = IT_VBAP-AUPOS.
When I check table VBRP - button INDEXED. - No indexed has been defined.
( I know how to create an Index and already did it on ZTable)
I want to know the Pros & Cons if I define an 'INDEX' on VBRP and it goes on Production Server.
Will it make any effect on previous Report or Data?
Is it sensible ?

NO, do NOT add an index. Read table VBFA forward (subsequent documents), and use that to get your VBRP primary key. Adding a secondary index is a remedy of last resort. One should make the effort to obtain the values for the primary table key wherever possible.
Think about it....would SAP have designed the database in such a way that we would need your proposed solution? And, as Siegfried notes, anyone who reports or works with SD/LE tables should read and heed 185530 before writing a single line of code.

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Hi There
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http://tanveeronline.blogspot.co.nz/2011/07/ssrs-2008-r2-unable-to-connect-to.html
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Experts - Please comment on your thoughts.

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{message:id=4060608}
>
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