Thank you @itonewbie ! however the client can  no longer and also don't want to contact the ex spouse. I read that he can instead withhold 30% tax, where can I add additional withholding tax int PTO?

 "If recipient lives in the country that does not have such exemption, then the payor must withhold 30% tax from alimony payment amount and pay to the IRS on behalf of the non-resident spouse. Alternatively, the foreign spouse should obtain a U.S. tax ID number, file form 1040NR (U.S. non-resident tax return), report receipt of the alimony and pay tax themselves."