2774869 - Country Italy or France-How to check which document numbering rule is used to determine the Supplier invoice ID when there is more than 1 rule

How to understand which one out of many rules available for same Company and Document type is picked by system to determine the numbering of Supplier invoice.

SAP Business ByDesign

wrong SDN; wrong sequential document numbering; wrong supplier invoice number; Wrong Document ID; Italy Invoice italy invoice,france invoice,wrong sequential document number,wrong document id,wrong supplier invoice number , KBA , AP-SIP , Supplier Invoice Processing , Problem