Field Level Authorization

Hi experts,

I have a query regarding the authorization concept.

I have a report where in I display some fields.Now in this report I need to implement field level authorizations.

I need to display the report, such that some users are able to change and read some fields and some users can only read those fields.To summarize, the fields are to be diaplyed based on the user authorization to read/ change fields in report.

The authorization-object is the concept at TCODE level.How do I achieve this at field level in the output report.

Any pointers on this are highly appreciated.