Errors by loading loading Flat file from BI Server into BI system

Dear Experts,

i am confronted with following problems. I have 2 Datasources based on flatfiles. Those files are stored on the BW server. The process chain should pickup those two files and load into BW.

But i haveing following errors:

1. Error 'The argument 'SALES' cannot be interpreted as a number' on assignment field SALES record 1 value SALES.

2. Error 'Unable to convert value SALES with currency
CURRE' at conversion exit RSDS_CONVERT_CURRENCY_INTERNAL (field SALES record 1, value SALES). For this i used the standard 0sales object which is automatically taken 0ccurenncy but i did not set the conversion routine.

Could you pleae help?

Thanks

Pat