Trade Negotiation Mapping to FIX 4.2 Message

Imported from previous forum

Hi !,

Could any one please help me using the Fix 4.2 Message to perform the following.

For providing all market participants a facility to negotiate trades outside the central quote and order book (Off Market Trade), by this facility the market participants are allowed to negotiate a price or size improvement with a selected group of market participants.

Thanks & Regards
Kenneth Nelson Parke