hello, friend.
if the customer has paid more than the accounts receivables your client has from this customer, the A/R will show negative values. this can be confirmed by going to FBL5N, among other possible transactions.
as mentioned, returns can also result in negatives in sales value. for this, you have to check open returns orders and returns deliveries (when applicable). credit memo requests and unposted credit memo billing types also contribute to the negative values.
but if these transactions do not explain the negative sales values, it might be that you have to reorganize credit data (if changes to credit accounts have been made).
regards.
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