Changing Payroll Areas

Hello guys: I have 8 different payroll areas with the same periodicity and same payment date.

If I change all EEs IT 0001 and use only one payroll area (the same for everybody); are there going to be any problems with the cluster?

I am planing on using as the date of change (begin date) the first day of a payroll period. I will also run this master data update after all the payrolls have been posted to FI.

Or what kind of problems could i encounter?

Thanks

Harlen