Interest Rate Instrument - Subledger Posting

Hi,

Are the following settings possible using Interest Rate Instrument?

- On posting of loan taken, the liability account is set-up as recon account, thus posting to SL is required; here's the required    entry

       Dr - CIB

       Cr.- Vendor

Is it even possible in Treasury to link my business partner to a vendor? I've tried it using customer and I was able to do so but is TPM1 forex valuation able to valuate on SL level?

Thanks,

Chaikaru