to check whether the field is a standard or was added by an abapper

there is a transaction called f.16 for fi module.

there was a field for GL account in version 4.6 but it is not there in ecc 6.0 version. now the functional consultant wants to check whether the field is a standard or was added by an abapper.

how to go about it.

please help.

its urgent.

thanks in advance.