BI-IP Data Slices to lock/unlock planning data.

Hi Experts!.

Can anyone provide an advise or guidence to use data slices for lock and unlock planning data using data slice with IP?.

I was read the SAP Help documentation about Data Slicing but stills unclear when to use data slice with exits and when to use selections...

My customer's requirement is basicly tu protect data in the outdate during the planning process. I mean, the planner defines a planning window from start date to end date. For eg. from 04/01/2009 until 04/10/2009 transactional data is available to plan, any data out of date range will be protected.

The main planning application es web-based and builded with IP.

Please advice, thanks in advance...