Withholding tax transaction are missing

I’m using ax 2009, I have a report from in GL > Withholding tax transactions.

In that report I can see only 2017 year Transaction, when I filter by 2016 year transaction report is empty.

this report using TaxwithHoldTrans table , in that table there is no 2016 year transaction,

But customer says they had 2016 year transaction. May I know what could be the reason for missing of 2016 year transaction. ?