Checkbox field problem

I have a form with a checkbox field tied to a custom valuelist of month numbers (01 02 03… etc. to 12). The dataprovider is a text field with various multiple month numbers that are separated by blanks. When I show the form, the checkboxes do not show the values in the dataprovider - they are all blank. The only way I can get the checkboxes to populate is to manually set them by checking the checkboxes. Anybody have an idea as to what I’m missing?

they should be seperate by a \n (enter)
not a blank (space)

Of course! thanks.