Space as a 1000 separator in Number formatting

Hi,

We are currently using  SAP BO Dashboard 4.1 SP4 (Version 14.1.4.1327). We have a requirement of representing Numerical values with space as a 1000 separator instead of ","(comma). The appearance tab for components provides only few formatting options as:

The workaround for this could be using custom format in spreadsheet itself. For positive numbers, it works fine but becomes messy for negative numbers. For example:

a custom format as ### ### ### ###.## would work for positive numbers as 213 345 423.23

but for a negative number say -25.40, it would display as   "-    25.40" instead of "-25.40", since there are 4 spaces in the custom format before decimal.

Please suggest if any workaround/custom format is possible for negative numbers.

Thanks,

Aarti Raghav