Hi,
Since you are using TAXINN procedure it will not be shown in FBCJ.
You are getting in PO because you are mainlining condition through Access sequence for certain combination in FV11.
We cannot maintain the condition in FV11 for FBCJ as there is no access sequence. In this case you require to enter tax values manually against the G/L.
We hope this solves your query else revert.
Regards,
Tejas