Tax error on PO
                    
 Hi
                When i am trying to save planned purchase order,the following error occurred
"An error occured during tax calculation.please correct the problem or contact your system administrator.your transaction has been saved.tax will be recalculated when the document is submitted for approval"
and also the error occurred when i press APPROVED button
"Error message: An expected error during tax calculation.
Exception 023: an expected error has occurred.please contact your system administrator.
Please correct the problem or contact your system administrator"
I check the location of ship to address,country code is ok
Steps to reproduce:
planned po>realeses>receipt>reciving transaction>invoice match>cancel invoice>correction receipt>releases cancel>amend Planned po and save(error occurred)
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