1. A method of processing transactions between at least one buying company and at least one selling company which results in the creation of a new collaborative data set, the method comprising: providing a central datastore accessible to users from the buying company and users from the selling company; obtaining via a computer network purchase order data having at least one entry, the purchase order data including purchase order header information and purchase order detail information; obtaining via a computer network invoice data having at least one entry, the invoice data including invoice header information and invoice detail information; comparing via a computer, selected purchase order data and corresponding selected invoice data to identify a matched record having purchase order data and corresponding invoice data; creating a collaborative data set in the central datastore based in part on the matched record and storing detailed settlement data in the datastore regarding settlement of the matched record of purchase order data and corresponding invoice data; providing for storage of additional settlement data in the central datastore, wherein credit memos, debit memos regarding the invoice and/or the purchase order of the matched record are stored as part of the collaborative data set; if users from the buying company and/or selling company dispute settlement of the transaction, then: providing for storage of settlement dispute data from the selling company which is stored as part of the collaborative data set; providing for storage of supporting images and documentation from the selling company which are stored as part of the collaborative data set; providing for storage of settlement dispute data from the buying company which is stored as part of the collaborative data set; providing for storage of supporting images and documentation from the buying company which is stored as part of the collaborative data set; reconciling the transaction using the matched record and settlement dispute data stored in the datastore.