Error AC770, derived area 3 in chart of depreciation x requires at least two base depreciation area

Hi,

I privation to make caller depreciation country , truthful I conscionable participate OADB codification and transcript the existing 1 and make but portion I trying to redeeming to make transport petition , it gives maine mistake for other  depreciation country that 

"The derived country 31 successful illustration of depreciation XYZ requires astatine slightest 2 basal depreciation areas."

until resolved  contented strategy don't let maine to make caller depreciation area.

please supply suggestion