Error FF 773 in FPG1

HI,

We have scenario of SD-FICA transaction posting which involves tax code posting.

I have maintianed these settings in FICA and in FICO properly including creating tax code in FTXP.

SD-FICA transaction posting is working successfully as tax code is posting correctly.

But when I am closing this FIKEY and transferring to FICO through FPG1, system is throwing error FF 773 ( to maintain tax code with  country i.e.FTXP which is already maintained).

So is there is any other suggestions to troubleshhot this issue.

Regards,

Paresh