OFX file has debits properly recorded, credits leave a blank field

Issue summary: 

When I attempt to convert my CSV file from USAA, the debit amounts are properly converted, but credits cause a blank amount field in my budgeting software (YNAB). 

Comments

Issue changes: 
Project: CSV Converter »

Are you talking about values with -- in front? i.e. --10.5
Is this supposed to be a positive number?