Roll up field throwing exception on refreshing


Scenario

I've Bank and Bank Fee look ups on a custom entity call Line Items. Upon change of Bank fee lookup, I am copying fee value in a currency roll up field using JavaScript. 
Now, I configured currency roll up field on Bank form to aggregate all fee that is used for a certain bank.

Problem
Upon refreshing the roll up field, it is throwing following error:

"Record currency is required to calculate rollup field of type currency. Provide a currency and try again"



Cause
Unavailability of Currency (schema name: TransactionCurrencyId) field on the form that contain the Roll up field, in my case that is custom entity Bank.

Resolution
I went down to solution, find the Currency under fields section of Bank, added that field on Bank form. 
Created a business rule to by default set its currency value and make it hidden. 

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