I have made configuration for WHT. I assigned the relevant WHT Codes to my Vendor also.
While raising invoice through F-43, I am getting the following message:
Withholding tax information ignored
Message no. 7Q338
The selected transaction is not a payment transaction, even though the posting key used is relevant for payments. The withholding tax is not processed, even though you are posting to a vendor subject to withholding tax.
You can deactivate the message in Customizing Change Message Control for Document Processing in work area 7Q.
Check whether you can use another posting key or another payment transaction (for example, FB05).
Thanks & Regards