Access 97/2000 Presision for Currency

I have a form, with two subforms on it.

The on subform has the detailed data, the other adds up one column from the detail. If the sum is not zero an error will pop up.

The detailed data is currency.

The data is saved as a Double with Two decimal spaces. For some reason it does not like the number 139,211.48
When I type this number in the subform does not add up to zero, even though it should

ant ideas?