FIX Specification for Spread orders

Imported from previous forum

Hi,

I’v come across a situation where our client requires us to support Spread orders for Equity derivativs and Currency derivatives via FIX 4.4.

I would like to know the tags which are specific for spread orders in FIX 4.4 .
There must be some mandatory tags for Spread Order requests that will be coming in FIX strings via Fidessa/Bloomberg.

Appreciate your help for detailed tag descriptions.

Thanks.