multiprovider issue

I have 3 basic infocubes -sales document header ,item and schedlue line.

I have combined these 3 infocubes and created mutliproivder.

When I pull the report out of multiprovider some of the values are not populating -Not assigned .

I have verified with sales document number in all individual basic cube.Values are available in the basic cube.

I have created query with sales document no and infoprovider(0infoprov infoobject) value.

When I execute the report It has to display same sales document no with 3 basic cube names.But it is displaying only one basic cube.

Same sales document no is available in the 3 basic infocube.

There is no issue in the identification also.

Advance thx