Why do we keep getting this error message - Check data error - 'Purchase Order total on order is (number) less / greater than total on order in stock files'

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Hi,

Hoping someone may be able to enlighten me.  A client has had the following error occur twice in the last week and, although the recommended fix works to clear it, I want to understand what they are doing to make it happen.  It is a pain because there are several users and it is Sage50 cloud accounts so it holds up a lot of work while we wait for the main computer to run the fix.

Check data error - 'Purchase Order total on order is 805.00 greater than total on order in stock files'

Thanks in advance.

Katie