SAP BPC 10: Transaction data load with Sign Change using(Conversion file)

Hi Friends,

Using "Load InfoProvider" Package to loading Transaction data from DSO for two Accounts (example: Account1 and Account2). I want to change Sign of "Accoint1" while I am loading data from DSO. I am tryign to do this with Conversion file "External: Account1 and Internal: Account1 and Formula: *-1.

But its not working. Could you please help me?

I dont want to change the sign for "Account2".

Thank you in Advance:

Kumar