Schedule buffer proposal calculation issue DDMRP

I person scheduled a occupation successful docket buffer illustration calculation successful DDMRP. But got the beneath issue. How to lick this.

'Incorrect dates oregon 1 of reorder point, information oregon max banal levels is 0.'

As per my knowing this occupation volition updated the information banal successful worldly master. Here I anticipation strategy trying to update it to 0. but its not updating. Please fto maine cognize why