Service Order Fields SET base on BP Attributes

Hi

I have the following requirement for Service process:

My Cliente wants to get from the BP Marketing attribute the BP Rank, example: GOLD, SILVER, BRONZE and base on this Rank set the Priority in the Service Order, and also if it possible to set the Inicial and end date for the Service.

I do'nt Find any BADI , where to do this.

Any Suggestion

Reward points.

Best Regards for all of you.