There is a field called 'PO Number' that can be populated while XOGging in a Transaction. The data entered here makes it to the ppa_wipapinfo.pono column. Is it possible to then display the value from here, in 'User Value 1' and 'User Value 2' fields? These correspond to ppa_wip.user_val1_id and ppa_wip.user_val2_id columns respectively.
It is not possible to use 'User Value 1' and 'User Value 2' attributes for Actual Transactions, since it is not possible to enter data into these attributes via XOG. Further, it is not supported to update DB columns of these attributes for this purpose.