Data Management sub system balances

Summary

Unable to load sub system balances

Content

I am missing something I feel is quite simple and have not yet uncovered my problem.  I've had an SR open nearly a month with very little traction.  I want to load balances as sub system amounts using Data Management.  In my source system mapping I have supplied value 'sub system' but this does not work, values do not import and no errors produce.

In my testing, I create a new import location and use existing import format, file construction is exactly the same.  Currency is supplied in the file and I'm loading to Functional.  Source type mapping using 'source system' loads values to Source System Balance, no problem.  If I remove Source Type mapping, leave blank, error file is produced, Unmapped Accounts.  So far, so good.  If I supply value 'Scott', I can validate this information in Data Management, begin the load in ARCS and it will show complete, no errors.  Process log in Data Management shows no errors either.  If I examine