I would start with the Design and Referene Guide. It does give a lot of info but enough to get you started. In short, here it was it says.
"ICMatchingforWorkflowUnit This returns a detailed Intercompany Matching Report table for the given Workflow Unit and several other Parameters. The Parameters here override what is already set up in the Workflow Profile. Method Query Example: {Workflow Profile Name}{Scenario Name}{Time Name}{Plug Account Override}{Suppress Matches Override}{Tolerance Override}{Filter} or {Flint}{Actual}{2011M1}{Empty String or A#MyPlugAccount}{Empty String or true/false}{Empty String or 0.0}{Empty String or Filter Expression}."