issue with range number at VF02 when releasing to accounting

Hi Gurus,

We have an issue with the number range at VF02 when releasing the invoice to accounting.

Error message is "For object RF_BELEG E178, number range interval 6A does not exist FBN1"

But when entering tx-FB1N for Company code E178 , it is not clear where range interval 6A is set for number range assignment.

Where is the range interval entered in sales so accounting document is generated?

thanks,

VL