Problem in Trading with Own Corporations

I put in the numbers, but when I click sell to all corporations, it keeps telling me to "Enter the Amount you want to order for a Corporation".

No matter what I do, it's not working.

Help please

Are you selling more supplies than you have in stock? Are you choosing 60 months but don't have 60 months worth of supplies?
Try picking a certain amount of months, like 6 or 12 months and see if that works.

Done, cool I appreciate it Keto