Cross join in webi

I have 2 separate data providers/queries

Let's say in the first one it returns something like this:

OrderId     Product          Amount

1              Apple           500

1              Orange         400

1              Banana         600

2               Apple           300

2               Orange        200

And in the second one it returns something like this:

OrderId     SalesPerson

1               Bob

1               Mary

2               Steve

I'd like to have the webi report output something like this (basically a cross join)

OrderId     Product     Amount     SalesPerson

1               Apple          500          Bob

1               Orange          400          Bob

1               Banana          600          Bob

1               Apple          500          Mary

1               Orange          400          Mary

1               Banana          600          Mary

2               Apple           300          Steve

2               Orange          200          Steve

I think I've tried every combination of merge dimensions/detail objects, etc. but always end up with either #INCOMPATIBLE or #MULTIVALUE in SalesPerson when there are multiple salespersons associated with an order (such as order 1 in the example above).  When there is only one SalesPerson associated with the order then it works as expected, such as below:

OrderId     Product     Amount     SalesPerson

1               Apple          500          #MUTLIVALUE

1               Orange          400          #MULTIVALUE

1               Banana          600          #MULTIVALUE

2               Apple           300          Steve

2               Orange          200          Steve

I can't really change the universe, so is this possible to do within webi?