Hello Raj,
Could you pls confirm the tax code created is OA/AO in FTXP once?
If the required tax code is not created in FTXP so pls create that tax code in FTXP.
Also pls chk the settings of this GL account in FS02. Is tax category field is checked or not to allow all type of taxes (*) category in the control data tab of FS02. If no, pls maintain this setting and rety once.
I hope it helps!
Thanks & Regards,
Lakshmi S