Hi Koti,
Here system is throwing error due to the tax code has not maintained along with its country. You have to add the table "003-Tax classification(Country/tax code fields)" for the access sequence of the tax condition in OBQ2. After maintain the tax code with country and tax code combination in FV11 for the tax condition. Then only it allow to post the document in FBCJ.
Regards,
Mukthar