Hi,

I am getting the following errors while converting Purchase Requisitions to Purchase Orders"

"Purchase Order is not generated"
"Tax Code field is required in Purchase Order Lines"
"No Tax Library specified in the Tax Parameters. Tax Defaulting is not Possible"

Regards,
Dinesh

Check if all the values in Tax Handling are defined properly for company you are transacting in..It seems while converting from Requisition to PO system is expecting valur in tax code on Purchase Order Lines sesssion which is not getting defaulted.