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Explanation: Given the apparent context, of managing tills, I would say that 'to post' is a verb here, and it means that the till manager is responsible for posting transactions voided by the cashiers to the accounts system (so that everything adds up right at the end of the day).
Assuming that 'post' is a noun ["the post is void"] seems to me to make a little less sense here.
Tony M France Local time: 07:35 Native speaker of: English PRO pts in category: 23