RDF Baseline Vs Causal SKU's difference

Good morning,

     I need some clarification when building Baseline and Causal workbook. To brief about the issue, when I try creating a Baseline WB under Forecast Maintenance.

     The product dimension is set at "SKU" level. But when the WB is built, it is showing at UPC level. Please refer the below screenshot:

    

    

          When I try the same method for Causal, it shows correctly. For example when the dimension is selected at Style or SKU level, the WB is built finally and showing at SKU level.  Please refer the below screenshot:

    

        

            

   

        I checked from RMS and the transaction levels are created correctly. Also from the product file that exists in the RDF domain has Style, SKU and UPC records for the item.