Document splitting for trading partner

Hi friends,

We have a requirement that the trading partner can also be split when posting FI document like profit center can be split. I cannot find characteristic of trading partner in config menu: Define Document Splitting Characteristics for General Ledger. Only fields of Business Area, Profit Center, and Segment can be added for document splitting. Is it possible to add trading partner as document splitting charcteristic?

Thanka in advance,

Jessie