Importing negative currecy figures into a custom field....

Hello All -

I am importing accounts with the import wizard. The data is culled from an old homegrown system and there is a need to know the YTD sales. I have created a custom field for YTD sales. However there are some negative numbers in the report. So when I start the import process and map that field and complete all the importing steps, i get an error that tells me none of the negative figures will be imported.

Any idea on what I am doing wrong? Or what I need to add to that field to accept those negative figures?

Thank you!