MIN Value of Multiple Columns across Multiple Tables with a Shared Table

[Anonymous]

Hello Power BI Community!! 

I am fairly new to DAX and having a few issues writing an expression for the below logic statement. I've attempted a few combinations of IF, RELATED, MIN/MINX with no luck. 

Avail_Transfer_Qty = IF 'OpenUsageTable'(OpenUsage Qty) >= 'ExcessTable'(Excess Qty)

                                      THEN 'ExcessTable'(Excess Qty)

                                       NOT  'OpenUsageTable'(OpenUsage Qty)

Data Model:  *Relationships use "Product" as Shared Value

Thank you very much in advance for any help!! Please let me know if you would like any additional information.

[Stachu · Accepted solution]

are you looking for a calculated measure or a column?

Column makes sense in the Product table, you can then use RELATEDTABLE with to get all the relevant rows from Open and Excess tables, sum the quantities (with SUMX) and then compare the aggregates

for measure you can use TREATAS
https://www.sqlbi.com/articles/propagate-filters-using-treatas-in-dax/

but for the comparison you should first aggregate values from Open and Excess

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[Anonymous]

This worked great! Thank you!!