ODS to ODS Loading "No Data Source with these Attributes"

BW3.1

I have an ODS that I want to use to load another ODS. Both of the ODSs are on the same system. I did a "Generate Export DataSource" on the first ODS and then created an Update Rule on the target ODS. Then I went back to the source ODS and tried "Update ODS dat in DataTarget. I received an error "There is no DataSource with these attributes". I went to the InfoSource area and fount the DataSource. I think I don't need to replicate the DataSource but I did it anyway. I have tried a number of time but cannot load data from one ODS to another. The Target ODS takes load from 3 different ODSs and one of them worked without a problem the rest have the same problem. Can someone help?