Unexpected settlement transactions

Hi,

I assume there is something wrong with the setup, but I cannot figure what. I see occurrence of two settlement transactions which sum to zero whenever I settle two transactions with a different posting profile.

Example:

A vendor invoice is created on 31.12.2013 with amount of 142.699,20 and posted using posting profile called STD. Then there were three payments which settled the invoice (posting profile is in brackets):

04.02.2014 3.272,99 (STD)

05.02.2014 -100.000,00 (STD)

11.02.2014 -39.426,21 (COMP)

When I checked vendor transactions, I found that this last transaction resulted in two transactions of the type Settlement which reverse each other. The amount is the same (39.426,21), posted in debit and credit side. It appears that whenever you settle two transactions with different posting profiles - you end up with a pair of new transactions. Can this be avoided?