How to Enable Ellipse button for selecting currency on workflow for custom Real field in PurchaseAgreement Workflow

Please help on this requirement

I have added one  real field in Purchase agreement header level and  customer wants to add that field in workflow level 

after selecting the field and giving the value its throwing error  "'A currency code must be specified for an amount field"

Customer wants to select the currency for particular amount field in workflow 

in standard we will get ellipse symbol of every amount field for selecting the currency

Standard process is below:

my case

Please help me further on this how we have to enable elipse symbol and selecting the currency field for this

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