getting data into Infocube

Hi

I added master data fields to infocube structure and activated and saw the data.This cube was getting data from an ODS.

I needed to delete few of these objects(i deleted the data in the cube before i did this)and then when i selected update data in data target from ODS,The updata rules were switched off and when i tried to activate these they are not activating even if the data is present in ODS.

Do i have to rescedule the data load to ODS and then try again?

What is the logic behind this?

I thought we can work with master data objects easily.

Thanks.

Haarika.