Return measure in the context of another table

[EnrichedUser]

I have a measure called Top Customer that is calculated in a sales table. It identifies the customer code an item is sold to the most.

Top Customer = 
FIRSTNONBLANK (
    TOPN (
        1, 
        VALUES ( Sales[CustomerID] ), 
        RANKX( ALL( Sales[CustomerID] ), _Measures[Times Imported],,ASC)
    ), 
    1 
)

I would like to return this measure in the context of my inventory table.

I do have an intermediate table called Item Branch that has all unique items as there are duplicates in the inventory and sales table.

Expected Output as table visual:

Inventory.Item TopCustomer

A                        AA
B                        AB

Thanks in advance and any SQLBI or related articles, I love to read. 

[v-eqin-msft]

Sorry for that the information you have provided is not making the problem clear to me. Can you please share more details to help us clarify your scenario?

Refer to:

How to Get Your Question Answered Quickly

How to provide sample data in the Power BI Forum

Best Regards,
Eyelyn Qin

[smpa01]

@EnrichedUser  is it kindly possible to provide a pbix (small) representative of your issue

[amitchandak]

@EnrichedUser , I doubt you can get it for an inventory item easily. what is the difference between Inventory.Item and ItemBranch.ItemID - are there more than one description, because you should try the same ItemBranch.ItemID or ItemBranch.Item

[EnrichedUser]

Item Branch is just a table with unique items. 

Inventory has duplicates of items and sales has duplicates.