
In your case, since unrealized WHT entries were already posted at invoice level, the payment journal may not generate additional WHT entries it may only settle or reverse unrealized amounts to realized, rather than creating new entries. That’s why you see no WHT entries will be posted during payment.
You likely have no setup issue; this behavior is standard. You should check the Withholding Tax Setup (realization rules and posting groups) and verify whether realization is expected at invoice or payment stage for your configuration.
https://www.youtube.com/watch?v=d4mYltz4Zwg
https://yzhums.com/71463/
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Regards,
Mansi Soni